Circuit Protection & Breakers


Circuit Protection & Breakers

All the industrial electrical equipment are exposed to damage and malfunction, and there is always a risk that someone may connect a device incorrectly or use it for the wrong applications. To ensure safety of any industrial installation it’s very critical to meet national codes and protect equipment and processes from excess energy that could cause damage or safety issues to prevent costly downtime.


As a part of system design and installation process, the electrical engineering team specifies the required circuit breakers and supplemental protectors - A device which can break the circuit.


Circuit Breakers

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current. Its basic function is to interrupt current flow after a fault (overload or fault current) is detected. Circuit breakers are made in varying sizes, from small devices that protect low-current circuits or individual household appliance, up to large switchgear designed to protect high voltage circuits. The function of a circuit breaker, RCD or a fuse is often abbreviated as Automatic Disconnection of Supply.


Line protection

Line protection is used whenever high-speed protection is required for all types of short circuits and for any fault location. For two-terminal lines, and for many multi-terminal lines, all the terminal breakers are tripped practically simultaneously, thereby permitting high-speed automatic reclosing. Pilot relaying is the best type for line protection.


Fuse

A fuse is an electrical safety device that operates to protect over current of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the current. Once a fuse has operated it is an open circuit, and it must be replaced or rewired, depending on type.


Return to main Industrial Automation Control page

Videos

Ben Heck's Essentials Series 3: Circuit Protection at Eaton

Engineer It: How to Design Protection Circuits for Analog I/O Modules

Optimum protection against overload and short-circuit - PHOENIX CONTACT

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  Manufacturer Part No Newark Part No. Manufacturer / Description
Availability Price for:
Price
Quantity
W31-X2M1G-20
W31-X2M1G-20 - Thermal Circuit Breaker, W31 Series, 20 A, 1 Pole, 50 VDC, 250 VAC, Panel

18M9758

Thermal Circuit Breaker, W31 Series, 20 A, 1 Pole, 50 VDC, 250 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 250V, 20A; Product Range:W31 Series; Current Rating:20A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V RoHS Compliant: Yes

227 in stock

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227 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 09/11/20

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W31-X2M1G-5
W31-X2M1G-5 - Thermal Circuit Breaker, W31 Series, 5 A, 1 Pole, 50 VDC, 250 VAC, Panel

18M9759

Thermal Circuit Breaker, W31 Series, 5 A, 1 Pole, 50 VDC, 250 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 250V, 5A; Product Range:W31 Series; Current Rating:5A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V RoHS Compliant: Yes

299 in stock

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299 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 09/11/20

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W23-X1A1G-50
W23-X1A1G-50 - Thermal Circuit Breaker, W23 Series, 50 A, 1 Pole, 50 VDC, 240 VAC, Panel

17M3340

Thermal Circuit Breaker, W23 Series, 50 A, 1 Pole, 50 VDC, 240 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 250V, 50A; Product Range:W23 Series; Current Rating:50A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V; Voltage AC:250V RoHS Compliant: Yes

399 in stock

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399 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 09/11/20

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W31-X2M1G-10
W31-X2M1G-10 - Thermal Circuit Breaker, W31 Series, 10 A, 1 Pole, 50 VDC, 240 VAC, Panel

17M3341

Thermal Circuit Breaker, W31 Series, 10 A, 1 Pole, 50 VDC, 240 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 240V, 10A; Product Range:W31 Series; Current Rating:10A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V RoHS Compliant: Yes

269 in stock

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269 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 16/11/20

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W23-X1A1G-10
W23-X1A1G-10 - Thermal Circuit Breaker, W23 Series, 10 A, 1 Pole, 50 VDC, 240 VAC, Panel

17M3339

Thermal Circuit Breaker, W23 Series, 10 A, 1 Pole, 50 VDC, 240 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 250V, 10A; Product Range:W23 Series; Current Rating:10A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel RoHS Compliant: Yes

650 in stock

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650 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 16/11/20

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KD1-2
KD1-2 - Thermal Circuit Breaker, KD Series, 2 A, 1 Pole, 50 VDC, 250 VAC, Panel

29F1602

Thermal Circuit Breaker, KD Series, 2 A, 1 Pole, 50 VDC, 250 VAC, Panel

EATON HEINEMANN

CIRCUIT BREAKER, THERMAL, 1P, 250V, 2A; Product Range:KD Series; Current Rating:2A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V; Voltage AC:250V RoHS Compliant: Yes

488 in stock

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488 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 28/09/20

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KD1-1
KD1-1 - Thermal Circuit Breaker, KD Series, 1 A, 1 Pole, 50 VDC, 250 VAC, Panel

29F1601

Thermal Circuit Breaker, KD Series, 1 A, 1 Pole, 50 VDC, 250 VAC, Panel

EATON HEINEMANN

CIRCUIT BREAKER, THERMAL, 1P, 250V, 1A; Product Range:KD Series; Current Rating:1A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel RoHS Compliant: Yes

261 in stock

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261 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 28/09/20

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TA35-CFTWF030C0
TA35-CFTWF030C0 - Thermal Circuit Breaker, TA35 Series, 3 A, 1 Pole, 32 VDC, 240 VAC, Panel

35M4248

Thermal Circuit Breaker, TA35 Series, 3 A, 1 Pole, 32 VDC, 240 VAC, Panel

SCHURTER

CIRCUIT BREAKER, THERMAL, 1P, 240V, 3A; Product Range:TA35 Series; Current Rating:3A; No. of Poles:1 Pole; Voltage Rating VDC:32VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel; Voltage AC:240V RoHS Compliant: Yes

276 in stock

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276 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 26/10/20

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T11-311-2
T11-311-2 - Thermal Circuit Breaker, T11 Series, 2 A, 1 Pole, 48 VDC, 240 VAC, Panel

32C2404

Thermal Circuit Breaker, T11 Series, 2 A, 1 Pole, 48 VDC, 240 VAC, Panel

SCHURTER

CIRCUIT BREAKER, THERMAL, 1P, 240V, 2A; Product Range:T11 Series; Current Rating:2A; No. of Poles:1 Pole; Voltage Rating VDC:48VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel; Voltage AC:240V RoHS Compliant: Yes

284 in stock

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284 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 30/11/20

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AF2-B0-46-620-212-D
AF2-B0-46-620-212-D - Magnetic Hydraulic Circuit Breaker, A Series, 20 A, 2 Pole, 277 V

01E9215

Magnetic Hydraulic Circuit Breaker, A Series, 20 A, 2 Pole, 277 V

CARLING TECHNOLOGIES

CIRCUIT BREAKER, 2 POLE, 277VAC, 20A; Product Range:A Series; Current Rating:20A; No. of Poles:2 Pole; Input Voltage VAC:277V; Interrupting Capacity:-; Trip Time:-; Dielectric Strength:1.5kV RoHS Compliant: Yes

550 in stock

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550 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 12/10/20

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T9-611P-5A
T9-611P-5A - Thermal Circuit Breaker, T9-611 Series, 5 A, 1 Pole, 48 VDC, 240 VAC, Panel

28K1540

Thermal Circuit Breaker, T9-611 Series, 5 A, 1 Pole, 48 VDC, 240 VAC, Panel

SCHURTER

CIRCUIT BREAKER, THERMAL, 1P, 240V, 5A; Product Range:T9-611 Series; Current Rating:5A; No. of Poles:1 Pole; Voltage Rating VDC:48VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel; Voltage AC:240V RoHS Compliant: Yes

1,583 in stock

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1,583 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 11/01/21

Restricted Item
T9-611P-16A
T9-611P-16A - Thermal Circuit Breaker, T9-611 Series, 16 A, 1 Pole, 32 VDC, 240 VAC, Panel

28K1539

Thermal Circuit Breaker, T9-611 Series, 16 A, 1 Pole, 32 VDC, 240 VAC, Panel

SCHURTER

CIRCUIT BREAKER, THERMAL, 1P, 240V, 16A; Product Range:T9-611 Series; Current Rating:16A; No. of Poles:1 Pole; Voltage Rating VDC:32VDC; Voltage Rating VAC:240VAC; Circuit Breaker Mounting:Panel RoHS Compliant: Yes

858 in stock

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858 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 11/01/21

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W51-A122B1-10
W51-A122B1-10 - Thermal Circuit Breaker, W51 Series, 10 A, 1 Pole, 50 VDC, 250 VAC, Panel

08H0788

Thermal Circuit Breaker, W51 Series, 10 A, 1 Pole, 50 VDC, 250 VAC, Panel

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, THERMAL, 1P, 250V, 10A; Product Range:W51 Series; Current Rating:10A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V; Voltage AC:250V RoHS Compliant: Yes

92 in stock

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92 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

More stock available week commencing 09/11/20

Restricted Item
W67-X2Q12-15
W67-X2Q12-15 - Magnetic Hydraulic Circuit Breaker, W6 Series, 15 A, 1 Pole, 277 V, 5 kA, 20 s

19M4742

Magnetic Hydraulic Circuit Breaker, W6 Series, 15 A, 1 Pole, 277 V, 5 kA, 20 s

POTTER&BRUMFIELD - TE CONNECTIVITY

CIRCUIT BREAKER, HYDROMAGNETIC, 1P, 277V, 15A; Product Range:W6 Series; Current Rating:15A; No. of Poles:1 Pole; Input Voltage VAC:277V; Interrupting Capacity:5kA; Trip Time:20s; Dielectric Strength:1.5kV; Operating Voltage:277VAC RoHS Compliant: Yes

74 in stock

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74 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

  • 144 more will be available on 22/09/20
  • More stock available week commencing 01/03/21

    Restricted Item
    W51-A121B1-10
    W51-A121B1-10 - Thermal Circuit Breaker, W51 Series, 10 A, 1 Pole, 50 VDC, 125 VAC, Panel

    08H0784

    Thermal Circuit Breaker, W51 Series, 10 A, 1 Pole, 50 VDC, 125 VAC, Panel

    POTTER&BRUMFIELD - TE CONNECTIVITY

    CIRCUIT BREAKER, THERMAL, 1P, 125V, 10A; Product Range:W51 Series; Current Rating:10A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:125VAC; Circuit Breaker Mounting:Panel; Operating Voltage:125V; Voltage AC:125V RoHS Compliant: Yes

    638 in stock

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    638 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 09/11/20

    Restricted Item
    W28-XT1A-3
    W28-XT1A-3 - Thermal Circuit Breaker, W28 Series, 3 A, 1 Pole, 32 VDC, 250 VAC, Panel

    34C4550

    Thermal Circuit Breaker, W28 Series, 3 A, 1 Pole, 32 VDC, 250 VAC, Panel

    POTTER&BRUMFIELD - TE CONNECTIVITY

    CIRCUIT BREAKER, THERMAL, 1P, 250V, 3A; Product Range:W28 Series; Current Rating:3A; No. of Poles:1 Pole; Voltage Rating VDC:32VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel RoHS Compliant: Yes

    203 in stock

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    203 in stock for same day shipping: Order before 5:45 pm EST (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 09/11/20

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    W58-XC4C12A-25
    W58-XC4C12A-25 - Thermal Circuit Breaker, W58 Series, 25 A, 1 Pole, 50 VDC, 250 VAC, Panel

    29M9967

    Thermal Circuit Breaker, W58 Series, 25 A, 1 Pole, 50 VDC, 250 VAC, Panel

    POTTER&BRUMFIELD - TE CONNECTIVITY

    CIRCUIT BREAKER, THERMAL, 1P, 250V, 25A; Product Range:W58 Series; Current Rating:25A; No. of Poles:1 Pole; Voltage Rating VDC:50VDC; Voltage Rating VAC:250VAC; Circuit Breaker Mounting:Panel; Operating Voltage:250V RoHS Compliant: Yes

    Available for back order

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  • 400 more will be available on 04/11/20
  • More stock available week commencing 09/11/20 Contact me when back in stock

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