An MCB is a type of switch that automatically trips and disconnects a circuit if it detects abnormal electrical conditions, such as excessive current flow. Unlike traditional fuses that melt and need replacing after a fault, MCBs can be reset, making them a more practical and economical solution for ongoing protection.
Unique thermomagnetic tripping unit with integrated thermal release prevents tampering and material deterioration, ensuring reliable overload tripping.
Reduced power dissipation and high electrical endurance (20,000 operation cycles). Operation in DC circuits up to 60V DC/pole.
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ETI offers several series of miniature circuit breakers, each designed to meet specific application needs:
The ETIMAT 6 series of miniature circuit breakers provides reliable protection with a focus on user safety and ease of installation.
Technical Data (General):
The ETIMAT 6 series is available in 1P, 1P+N, 2P, 3P and 3P+N configurations.
The ETIMAT 1N series offers a compact solution with a protected line pole and a switched neutral pole within a single housing.
Key Advantages:
Technical Data (General):
Please refer to the catalogue for specific code numbers based on the rated current and tripping characteristic.
The ETIMAT P series represents a new generation of miniature circuit breakers, offering enhanced features and performance. This series includes the ETIMAT P6 and ETIMAT P10 models.
Technical Data (General - ETIMAT P6):
The ETIMAT P6 series is available in 1P, 1P+N, 2P, 3P, and 3P+N configurations.
Technical Data (General - ETIMAT P10):
The ETIMAT P10 series is available in 1P, 1P+N, 2P, 3P, and 3P+N configurations. Notably, 3-pole + N versions of ETIMAT P10 are suitable for use as 4-pole circuit breakers.
ETIMAT P10 Reset Version:
The ETIMAT P10 Reset version offers a special feature where the toggle position clearly indicates the reason for tripping.
"Trip" (middle) position: Indicates tripping due to overcurrent.
"Off" (lowest) position: Indicates manual turn-off.
This prevents user mistakes and clarifies whether the system shutdown was intentional or due to a fault. Technical data for the ETIMAT P10 Reset series largely mirrors that of the standard ETIMAT P10, with availability in B and C characteristics for 1P, 1P+N, 2P, 3P and 3P+N configurations. Please refer to the catalogue for specific code numbers.
The ETIMAT P10-DC series is specifically designed for the protection of conductors in direct current electric circuits.
Key Features:
Technical Data (General):
The ETIMAT P10-DC series is available in 1-pole and 2-pole configurations. Note that two 1-pole MCBs cannot be used instead of one 2-pole MCB in DC applications.
The ETIMAT 10 series caters to higher current applications ranging from 80 to 125A.
Key Features:
Technical Data (General):
The ETIMAT 10 (80-125A) series is available in 1-pole, 2-pole, 3-pole, 3-pole + N, and 4-pole configurations.
An MCB is a type of switch that automatically trips and disconnects a circuit if it detects abnormal electrical conditions, such as excessive current flow. Unlike traditional fuses that melt and need replacing after a fault, MCBs can be reset, making them a more practical and economical solution for ongoing protection.
How Does a Miniature Circuit Breaker Work?
MCBs use two main mechanisms to detect and respond to faults:
Selecting the appropriate MCB type is essential to match the nature of the electrical system and specific load types. MCBs are categorized by their tripping characteristics, or trip curves, which define the range of current that will cause the breaker to trip.
Type B:
Type C:
Type D:
Type K:
Type Z:
Current capacity
MCBs are available in various amperage ratings, typically ranging from 0.5 to 125 amperes. The current rating indicates the maximum current the MCB can handle under normal operating conditions without tripping. It’s essential to match the MCB’s rating to the circuit’s normal load to ensure reliable protection while avoiding frequent, unnecessary trips.
Voltage specifications:
These devices are designed for specific voltage levels, commonly 120-240V for residential applications and up to 415V for industrial use.
The Breaking Capacity of a Miniature Circuit Breaker (MCB) is a crucial specification that defines the maximum fault current the MCB can safely interrupt without sustaining damage. This rating indicates the MCB's ability to handle sudden surges of current (fault currents) that occur during short circuits or severe overloads.
In residential or light commercial applications, MCBs typically have breaking capacities of 6 kA to 10 kA, which is sufficient for circuits with lower fault current levels. Industrial applications, where fault currents can be much higher, may require MCBs with breaking capacities ranging from 15 kA to 25 kA or more.
Miniature circuit breakers manufactured in compliance with international safety standards IEC/EN 60898 and IEC/EN 60947-2.
Choosing the correct MCB is crucial for ensuring system safety and performance. Follow these guidelines to select the right MCB:
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