Siemens Auxiliary Contact Block 1NC – 3MH7901-0CT1

Description for Siemens Auxiliary Contact Block 1NC – 3MH7901-0CT1

The Siemens 3MH7901-0CT10 auxiliary switch is part of the SINOVA accessory range for industrial contactors. It provides an additional 1 NC (normally closed) contact that mounts on the front of 3MT7 and 3MH7 series contactors or contactor relays, enabling monitoring of contactor state or integration into control logic.

– Compatibility: Designed specifically for Siemens 3MT7 power contactors and 3MH7 contactor relays, fitting sizes 0 through 4.
– Electrical performance: The auxiliary contact block supports standard industrial control currents, with rated switching capacities at AC and DC voltages typical for control circuits.
– Durability: It features a long mechanical life (up to 10 million operations) and a substantial electrical endurance (100 000 cycles at AC-15/230 V).
– Robust construction: With a 690 V insulation rating and 6 kV surge resistance, plus IP20 front protection, it’s suitable for industrial environments.
– Mounting and connections: Snap-on mounting and screw-type terminals facilitate quick installation and secure conductor connections.

This auxiliary switch is ideal for extending the feedback and control capabilities of motor starters, automation panels, and machine control systems that use Siemens contactors.