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

17M3341

POTTER&BRUMFIELD - TE CONNECTIVITY

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

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

282 in stock

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282 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

More stock available week commencing 10/5/20

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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

POTTER&BRUMFIELD - TE CONNECTIVITY

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

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

418 in stock

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418 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

More stock available week commencing 9/21/20

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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

POTTER&BRUMFIELD - TE CONNECTIVITY

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

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

678 in stock

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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

POTTER&BRUMFIELD - TE CONNECTIVITY

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

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

324 in stock

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324 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

More stock available week commencing 9/21/20

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

29F1601

EATON HEINEMANN

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

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

216 in stock

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216 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

  • 100 more will be available on 7/27/20
  • More stock available week commencing 8/17/20

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

    29F1602

    EATON HEINEMANN

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

    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

    341 in stock

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    341 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 8/17/20

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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

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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

    212 in stock

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    212 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 10/5/20

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    W31-X2M1G-20
    W31-X2M1G-20 - Thermal Circuit Breaker, W31 Series, 20 A, 1 Pole, 50 VDC, 250 VAC, Panel

    18M9758

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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

    235 in stock

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    235 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 9/21/20

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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

    CARLING TECHNOLOGIES

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

    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

    551 in stock

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    551 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 9/7/20

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

    19M4742

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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

    83 in stock

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    83 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

  • 144 more will be available on 9/22/20
  • More stock available week commencing 11/9/20

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

    32C2404

    SCHURTER

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

    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

    288 in stock

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    288 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 10/19/20

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

    34C4550

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 10/5/20

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

    08H0784

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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

    964 in stock

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    964 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 10/5/20

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

    28K1540

    SCHURTER

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

    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

    1,871 in stock

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    1,871 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 11/30/20

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

    28K1539

    SCHURTER

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

    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

    958 in stock

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    958 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 11/30/20

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

    35M4248

    SCHURTER

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

    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

    281 in stock

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    281 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 9/14/20

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

    08H0788

    POTTER&BRUMFIELD - TE CONNECTIVITY

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

    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

    + Check Stock & Lead Times

    92 in stock for same day shipping: Order before 8pm EST Standard Shipping (Mon – Fri. Excluding National Holidays)

    More stock available week commencing 10/5/20

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