Almost 90 % of all systems are operated at 24 Vdc. For the availability and operational reliability of such systems, reliable and selective protection of the 24 V control voltage level is a mandatory. Ultimately, a permanent overload can damage wire insulation and may cause a long-term shutdown. It is also essential that the protection concept can be flexibly adapted to the respective conditions and be optimally integrated into the overall system. In the final application, various numbers of protection channels are required and, if needed, individual channels can be subsequently added. If a detailed status of individual loads is to be monitored remotely, currently available products are providing limited features only. Let us show you how the modular circuit breaker system, EasyB from BLOCK, demonstrates how this can be done differently.


With the new addition of 48 V variants, EasyB is the fi rst modular solution worldwide that meets all requirements for setting up Industry 4.0-capable systems in condition monitoring and predictive maintenance for 48 V systems.

The requirements regarding the tripping behavior of electronic circuit breakers in machines and systems are manifold: loads with high starting and inrush currents such as drives and contactors, for instance, require different tripping characteristics to sensors and controls which react sensitively to system voltage drops. BLOCK is expanding its EasyB model range to include a new and fast tripping characteristic so that it can provide the optimum solution to the user for the relevant application in all cases. This means that safe tripping following a short circuit within 2 ms and the switching on of capacitive loads with up to 40 mF is no problem for EasyB.

The new single-channel and dual-channel versions are all UL 508 and UL 2367 certified and NEC Class 2 certified from 1A to 4A. The requirements for line protection according to EN 60204-1 are also met with internal fuses individually adapted to the rated current from 1A to 10A.


Circuit breakers with thermomagnetic, fast-tripping and current-limiting characteristics represent a cost-effective alternative to conventional circuit breakers. The wide selection of shutdown characteristics guarantee reliable tripping for any application, including at high line impedances.


Modules with thermomagnetic tripping characteristics show the same tripping behavior as conventional circuit breakers. In operation, these modules can accommodate high starting or inrush currents for loads over short periods. Ideal for inductive loads – such as contactors, drives and valves.


The fast-tripping alternative to standard characteristics, particularly at rated currents <6 A. These universal modules can be relied on to trip in less than 2 ms in the event of a short circuit, thereby limiting the potential for system voltage drops. Ideal for sensitive loads such as control systems and sensors.


These modules limit the overcurrent for any circuit to a maximum of 1.7 times the rated current set. In the event of a persistent overcurrent, only the defective circuit is shut down on a selective basis. Any voltage drop in circuits not affected is prevented with a high degree of reliability. Ideal for capacitive loads > 70 mF, which can be charged at constant current without any problems at the time of switching on.

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EasyB circuit breaker system

EasyB – The modular 24 V circuit breaker system