2.2.1 Industrial circuit breaker

Discover our range of industrial circuit breakers

Range of industrial thermal-magnetic circuit breakers (three-phase and single-phase four-pole).


- Overload and short-circuit protection: Curve D, curve C. 

- High breaking capacity

Which protection to choose? => Selection guide

Find out more

What is a thermal-magnetic circuit breaker?

The circuit breaker is installed on an electrical panel, and it protects the circuit parameters. In case of a problem, the circuit breaker cuts the power. The circuit breaker ensures the security of your electrical installation and of your users.

The circuit breaker has an overload and short-circuit protection under 2 principles: thermal or magnetic.

-          The magnetic circuit breaker detects short-circuits

-          The thermal circuit breaker detects overloads

Then, the circuit breaker has an overload and short-circuit protection.


Characteristics of industrial circuit breakers

-         The number of poles (1 pole, 1 pole + neutral, 2 poles, 3 poles, 3 poles + neutral, 4 poles). See below

-         The breaking capacity in KA (4.5 KA, 10 KA, 30 KA) is the maximum intensity that the circuit breaker can cut. This parameter is important depending on the proximity of the circuit breaker to the high-voltage (or not) transformer.

-          The rated overload current (In). It is the limit from which the circuit breaker cut the current (thermal protection). Industrial size breakers are from 1 A to 63 A, and up to 1250 A for non-modular models.

-          The trip curve: B (3 to 5 x In), C (5 to 10 x In), D (10 to 20x In)


How to read an electrical circuit breaker?

In addition to symbols, you will find on your circuit breaker the curve + intensity. For example:

-          C10: circuit breaker curve C – rated intensity 10A

-          D62: circuit breaker curve D – rated intensity 63A


Which circuit breaker to choose?

To protect your electrical installation, the intensity of the circuit breaker must fit  with the protection intensity of the installation.

Circuit breakers are also characterised by their number of poles. The circuit breaker can protect several wires, it has several terminals called poles.

-          Circuit breaker 1P or unipolar: an input terminal + an output terminal

-          Circuit breaker 1P+N: 2 input terminals + 2 output terminals. The protection is made on 1 unique pole, but it cuts the terminals.

-          Circuit breaker 2P or bipolar: 2 input terminals + 2 output terminals. The protection is made on 2 poles contrary to the circuit breaker 1P+N.

-          Circuit breaker 3P or three-phase: 3 input terminals + 3 output terminals, it protects the installations supplied in three-phase.

-          Circuit breaker 4P or four-pole: 4 input terminals + 4 output terminals for three-phase supplies.


Which curve to choose for a circuit breaker?

We offer industrial circuit breakers curve C or D at EASI-Spare.com.

The circuit breaker curve C is the circuit breaker aimed for « standard » starts, such as resistances, installations without electric motors.

The circuit breaker curve D takes a more important current. Thus, it takes more important current demands when starting the machine, and especially for electric motors and their inductive load.

We also offer a range of residual current circuit breakers for protecting individuals.

7 product(s)
Mini circuit breaker 1+N
  • -5%

Mini circuit breaker 1+N

Miniature circuit breaker unipolar + neutral
Regular price €9.00 Price
€8.55 Excl. tax

Circuit breaker 3P+N
  • -5%

Circuit breaker 3P+N

3-poles circuit breaker + neutralCurve C
Regular price €29.90 Price
€28.41 Excl. tax

DC circuit breaker
  • -5%

DC circuit breaker

Electric circuit breaker for direct current
Regular price €7.27 Price
€6.91 Excl. tax

Auxiliary switch
  • -5%

Auxiliary switch

Auxiliary switch 1NO + 1NCFor circuit breaker IMO
Regular price €8.53 Price
€8.10 Excl. tax

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