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Showing Results For: Motor Protection Circuit Breakers

Motor Protection Circuit Breakers

Motor Protection Circuit Breakers (MPCBs), also called motor circuit protectors, are specialised electromechanical devices engineered to safeguard electric motors from various electrical faults and overloads. They detect electrical anomalies such as overcurrent, short circuits, phase imbalance, and thermal overload and interrupt the circuit to prevent damage to the motors and associated equipment. A motor protection circuit breaker is indispensable in environments where motor-driven machinery is prevalent, ensuring comprehensive safety and operational efficiency. MPCBs integrate a thermal device (thermal overload relay) and magnetic device, thus serving as dual-function circuit breakers, protecting against short circuits, overloads, and other electrical failures.

Why Buy a Motor Protection Circuit Breaker?

MPCBs are significant in interrupting excessive current flow, which can cause motor damage or fire hazards. They are compact, cost-effective, and adjustable, allowing precise settings aligned with the specific needs of the motor to be protected. Motor protection circuit breakers benefit users by efficiently detecting various faults, thus enhancing the lifespan of machinery and maintaining optimal performance. Additionally, MPCBs often boast advanced features like manual control for switching the motor on or off, providing a convenient method for maintenance and emergency handling.

Popular Types of Motor Protection Circuit Breakers

MPCBs come in various types based on their operational mechanisms, integrated elements, and type of protection, such as:

  • Thermal Magnetic MPCBs – These circuit breakers protect against long-term overload conditions. A thermal magnetic MPCB provides quick action during short circuits through an electromagnetic mechanism that trips the breaker instantly when a high current is detected.
  • Magnetic-Only MPCBs – These devices come only with magnetic elements, protecting against short circuits. These breakers are suitable where precise overload protection is handled by other means.
  • Electronic MPCBs – These circuit breakers are the more precise devices that provide adjustable trip settings. They utilise electronic sensing and relay logic to provide both overload and short-circuit protection. 
  • Manual MPCBs – These are manual switches designed to protect a motor by allowing operators to control it manually. They do not use bimetallic strips or magnetic coils.
  • Combination Starters – These devices combine an MPCB with a contactor for both protection and control of the motor. They provide a comprehensive solution that can include overload, short-circuit, and under-voltage protection.

Typical Applications of Motor Protection Circuit Breakers

MPCBs find versatile applications across residential, commercial, and industrial motor-driven systems where electric motors are used and require electrical protection. Some typical applications of MPCBs include:

  • Manufacturing
  • HVAC Systems
  • Pumps
  • Compressors
  • Refrigerators
  • Elevators & Escalators
  • Washing Machines.

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3RV10110HA10, Siemens
11 In Stock
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1 +
£ 42.11
10 +
£ 39.58
15 +
£ 37.90
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3RV10111FA10, Siemens
11 In Stock
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£ 65.22
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3RV10111CA10, Siemens
1 In Stock
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£ 56.99
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3RV10111HA10, Siemens
7 In Stock
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1 +
£ 56.99
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3RV10111GA10, Siemens
Pre Order
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£ 56.99
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3RV10111EA10, Siemens
25 In Stock
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£ 65.22
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3RV10110AA10, Siemens
2 In Stock
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1 +
£ 54.47
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3RV10110JA10, Siemens
11 In Stock
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£ 42.11
10 +
£ 39.58
15 +
£ 37.90
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3RV10111AA10, Siemens
32 In Stock
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£ 44.66
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£ 41.99
15 +
£ 40.20
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3RV10110EA10, Siemens
13 In Stock
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£ 40.60
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£ 38.17
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£ 36.55
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3RV10110KA10, Siemens
12 In Stock
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£ 44.66
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£ 41.99
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£ 40.20
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3RV10110BA10, Siemens
9 In Stock
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£ 38.91
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£ 36.59
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£ 35.02
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3RV10111DA10, Siemens
8 In Stock
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£ 46.94
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£ 44.12
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£ 42.25
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3RV10110CA10, Siemens
3 In Stock
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£ 38.91
10 +
£ 36.59
15 +
£ 35.02
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3RV10111KA10, Siemens
12 In Stock
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£ 52.42
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£ 49.28
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£ 47.18
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3RV10110FA10, Siemens
13 In Stock
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£ 39.24
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£ 36.88
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£ 35.32
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3RV10111JA10, Siemens
6 In Stock
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£ 72.47
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3RV10111BA10, Siemens
25 In Stock
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£ 46.94
10 +
£ 44.12
15 +
£ 42.25
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3RV10110DA10, Siemens
20 In Stock
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£ 40.60
10 +
£ 38.17
15 +
£ 36.55
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3RV10110GA10, Siemens
11 In Stock
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£ 39.56
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£ 37.19
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£ 35.60
072734 | PKZM0-1, Eaton
8 In Stock
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£ 89.09
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£ 83.75
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£ 80.19
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072738 | PKZM0-6,3, Eaton
68 In Stock
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£ 89.09
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072732 | PKZM0-0,4, Eaton
2 In Stock
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£ 74.21
072737 | PKZM0-4, Eaton
10 In Stock
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£ 89.09
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072735 | PKZM0-1,6, Eaton
31 In Stock
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£ 87.42
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£ 82.18
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£ 78.69
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3RV10110HA10, Siemens

3RV10110HA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10111EA10, Siemens

3RV10111EA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10111FA10, Siemens

3RV10111FA10, Siemens

Three-pole, Motor Protective Circuit Breakers – 3RV10 Range The 3RV10 current limiting motor starter protector is commonly known as a motor protection switch, as they are used for switching and protecting induction motors. Seimens 3RV Manual Motor Starters are optimized for load feeders. The motor circuit breakers are compact and offer long term stability. Applications • Short-circuit protection • For motor protection • System protection • Transformer protection • Emergency Stop Switches • Fuse Monitoring Conditions 3RV1 Motor Starter Protections are vulnerable to environmental factors such as dust and caustic vapours. As such, suitable enclosures are must be provided when operating in damp or dusty conditions. Features Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
072734 | PKZM0-1, Eaton

072734 | PKZM0-1, Eaton

Eaton Motor Protective Circuit Breaker - PKZM0 Eaton's reliable and robust motor protection circuit breakers are the perfect solution for protecting your motors from faults such as an overload of high voltages, short circuits or relay shutdowns. Down-time of machinery can be detrimental to a business and its operations, Eaton's PKZM0 range of motor protection circuit breakers has been created and designed to act as an intermediary between your devices, protecting vital equipment in the event of unforeseen incidents. This reduces the amount of downtime of machinery to enable operations to continue running smoothly. Features & Benefits • DIN-rail mounting • Forms part of the xStart family of control gear products • Typical moto protection accessories – Shunt release 492-1709 & 492-1715 , lockable rotary handle 244-0113 • Rated operating voltage 690Vac How do I select the right Motor Protection Circuit Breaker? MPCBs are more critical now than ever. Most infrastructures now rely on a motor behind the scenes to power critical uninterruptible systems such as heating, ventilation and cooling. These systems are vital in ensuring business continues as usual, therefore must be protected against overcurrent's, thermal overloads and similar problems. To select the right MPCB, consider the systems you and your business rely upon. Checking the features and benefits of each MPCB will prove invaluable when deciding what critical infrastructure you wish to protect.
New items
PKZM0-0,25, Eaton

PKZM0-0,25, Eaton

PKZM0 Rotary Switch Operated MPCB Modular Motor Protective Circuit Breakers designed for use with add-on contactor modules and accessories which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up assembly work and minimise wiring errors.,Various enclosure options are available, see PKZM Enclosures range. Rated operating voltage 690Vac Operating temperature range -25°C to +55°C Temperature compensated range -5°C to +40°C Adjustable current trip level, 0.6 – 1.0 x nominal rating Short-circuit trip level (fixed) 14x nominal rating Single-phase-failure sensitivity to IEC60947-4-1 Dimensions 195 x 45 x 77 (HxWxD) mm Rotary switch operation with padlockable handle option, see accessories On/Off/Tripped indication may be locked in the "off" position with handle Approvals UL, CSA, LROS, GL Standards IEC (EN60) 947-1 general, 947-2 Circuit breakers, 1-4 switch disconnectors, 1-5 Motor starters, 1-6 Electrical equipment of machines
New items
088912 | PKZM0-1,6-T, Eaton

088912 | PKZM0-1,6-T, Eaton

Transformer Protection Switches, PKZM0-T DIN rail mounted, mechanically reset protection devices. Transformer short circuit and overload protection The short circuit release is set to 20 x I u , so even transformers that have high inrush currents have protection Rotary handle for ease of trip indication after a fault has occurred Rated operational voltage 690V Trip-fault indication Phase failure sensitive 93 x 45 x 76mm (H x W x D) Note PKZMO accessories can be used allowing additional functions.
New items
PKZM01-0.16, Eaton

PKZM01-0.16, Eaton

PKZM01 Pushbutton Operated MPCB Modular Motor Protective Circuit Breakers designed for use with add-on contactor modules and accessories (see below) which provide isolation, short circuit and thermal protection. The units are DIN-rail mounting and part of the xStart family of control gear products, and a range of connection and wiring accessories are available to speed up assembly work and minimise wiring errors.,Various enclosure options are available, see PKZM Enclosures range. Rated operating voltage 690Vac Operating temperature range -25°C to +55°C Temperature compensated range -5°C to +40°C Adjustable current trip level, 0.6 – 1.0 x nominal rating Short-circuit trip level (fixed) 14x nominal rating Single-phase-failure sensitivity to IEC60947-4-1 Simple two-button operation for starting and stopping motors May be locked in the "off" position Approvals UL, CSA, LROS, GL Standards IEC (EN60) 947-1 general, 947-2 Circuit breakers, 1-4 switch disconnectors, 1-5 Motor starters, 1-6 Electrical equipment of machines
New items
3RV10110AA10, Siemens

3RV10110AA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10110JA10, Siemens

3RV10110JA10, Siemens

Three-pole Circuit Breakers – 3RV10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947 Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RV10414KA10, Siemens

3RV10414KA10, Siemens

Three-Pole Circuit Breakers - 3RV 10 Range Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Approvals UL, CSA Standards IEC947, VDE0990, EN60947
New items
SM1X16230, Lovato

SM1X16230, Lovato

SM1 Shunt Trip Release Connectable to the left side of the breaker In-rush consumption: 20VA Operating limits: 0,7 - 1,1 Us Lovato Orange Contactors, Control Relays and Accessories
New items
3RV1021-4CA10, Siemens

3RV1021-4CA10, Siemens

Three-pole, Motor Protective Circuit Breakers – 3RV10 Range The 3RV10 current limiting motor starter protector is commonly known as a motor protection switch, as they are used for switching and protecting induction motors. Seimens 3RV Manual Motor Starters are optimized for load feeders. The motor circuit breakers are compact and offer long term stability. Applications • Short-circuit protection • For motor protection • System protection • Transformer protection • Emergency Stop Switches • Fuse Monitoring Conditions 3RV1 Motor Starter Protections are vulnerable to environmental factors such as dust and caustic vapours. As such, suitable enclosures are must be provided when operating in damp or dusty conditions. Features Maximum rated current 100A (45kW @ 400V a.c.) Rated operational voltage: 690V Short-circuit proof to 50kA @ 400V a.c. Maximum switching frequency; 15 operations/hour Mechanical life; 10 5 operations Ambient temperature range; –20 to +60 ° C Long term stability Manual reset Lockable in off position Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
FAQs
We offer free shipping for orders over £200 if delivery is in the UK. All other orders in the UK, shipping from £7.99 depending on the weight and measurement. Mainland Europe shipping charges start from £25. For all other countries shipping charges start from £50 for products like Motor Protection Circuit Breakers and all others.
You can email us directly at sales@enrgtech.co.uk or via our website for any queries regarding Motor Protection Circuit Breakers or any other product.
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Yes, we offer special discounts on orders above £200 for Motor Protection Circuit Breakers and all other products.
UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Motor Protection Circuit Breakers.
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