Why Choose the ABB MCBH-21 Contact Blocks with Holder?
The ABB MCBH-21 is a modular contact block assembly with 3-position holder designed for ABB pilot devices. Supplied as a complete assembled unit, it includes two normally open (2 NO) and one normally closed (1 NC) contact block, providing three switching contacts for industrial control and signalling circuits.
The MCBH-21 is designed for front mounting behind non-illuminated operators. Its included holder accommodates three contact blocks, with all three positions populated in the supplied 2 NO + 1 NC configuration. This makes it particularly useful where a single pushbutton, selector switch or compatible operator must control several electrical functions simultaneously.
The contact blocks use screw-clamp connections and provide IP20 terminal protection. ABB's modular construction supports straightforward installation and servicing within industrial control panels. ABB identifies this exact contact block and holder assembly under order code 1SFA611605R1112.
Key Advantages
- Supplied with 2 NO + 1 NC contacts for three separate switching functions.
- Includes an ABB 3-position contact block holder.
- All three available holder positions are populated.
- Designed for front mounting behind compatible non-illuminated operators.
- Screw-clamp terminals provide conventional and secure field wiring.
- IP20 terminal protection when correctly installed.
- Modular construction supports efficient installation, replacement and maintenance.
Key Features
- ABB MCBH-21 contact block assembled unit.
- 2 NO + 1 NC contact configuration.
- 3-position holder included.
- Three contact blocks supplied with the holder.
- Front mounting arrangement.
- Designed for non-illuminated operators.
- Screw-clamp electrical connections.
- IP20 terminal protection.
- Part of ABB's Modular plastic pilot device range.
Three-Contact Switching for ABB Modular Pilot Devices
The ABB MCBH-21 provides two normally open contacts and one normally closed contact from a single compatible operator. This combination enables several control functions to be operated simultaneously, making the assembly suitable for applications involving control commands, interlocking, auxiliary signalling and other machine-control functions.
Because the three contact blocks and 3-position holder are supplied together, the MCBH-21 provides a convenient preconfigured solution for panel builders and machine manufacturers. The modular front-mounted design also facilitates contact-block installation and replacement during assembly or maintenance.
Typical Applications
- Industrial pushbutton control circuits.
- Selector switch assemblies.
- Machine start and stop controls.
- Control and interlocking circuits.
- Auxiliary signalling functions.
- Industrial operator stations and OEM control panels.
