The MCB-10B is a modular contact block designed as an accessory for control circuit devices in industrial automation systems. It features 2 normally open (NO) auxiliary contacts with a rated operational current of 6 A at 230 V AC (AC-15) and 5 A at 24 V DC (DC-13), operating at supply frequencies of 50–60 Hz. The contact block is non-illuminated, back-mounted without a holder, and offers a degree of protection of IP20 for auxiliary terminals in accordance with IEC 60529 and IEC 60947-1. With a mechanical durability rating of 10 million cycles, the MCB-10B is suitable for integration with a wide range of modular control devices and provides reliable auxiliary switching for motor control, signaling, and interlocking applications.