Why Choose the ABB MCB-11B Contact Block?
The ABB MCB-11B is a double contact block designed for rear mounting with compatible ABB Modular pilot devices. It combines one normally open (1 NO) and one normally closed (1 NC) contact in a single compact assembly, providing complementary switching functions for industrial control, signalling and interlocking circuits.
The MCB-11B uses durable silver (Ag) contacts and screw-clamp terminals for secure field wiring. Rated for operational voltages up to 690 V, the contact block provides strong electrical performance for industrial machinery and control-panel applications while its self-cleaning contact design supports dependable long-term operation.
Designed for rear mounting, the MCB-11B is supplied without a holder and is compatible with a wide range of ABB pushbuttons, selector switches, machine-stop and emergency-stop operators. ABB identifies this exact contact block under order code 1SFA611610R2011.
Key Advantages
- 1 NO + 1 NC double contact block provides complementary switching functions.
- Rear mounting configuration for compatible ABB Modular pilot devices.
- Durable silver (Ag) contacts for reliable industrial switching.
- Rated operational voltage up to 690 V.
- Screw-clamp terminals provide secure and conventional field wiring.
- IP20 terminal protection when correctly installed.
- High mechanical durability for demanding industrial control applications.
Key Features
- ABB MCB-11B contact block.
- Double contact block construction.
- 1 NO + 1 NC contact configuration.
- Silver (Ag) contacts.
- Rear mounting.
- Non-illuminated.
- Supplied without holder.
- Screw-clamp connection.
- 690 V maximum rated operational voltage.
- 10 million operations mechanical durability.
Reliable Complementary Switching for Industrial Controls
The ABB MCB-11B combines normally open and normally closed contacts within one double contact block, allowing a compatible operator to make one circuit while simultaneously breaking another. This arrangement is useful for machine control, electrical interlocking, auxiliary signalling and other applications requiring complementary switching from a single operator.
Its rear-mounted modular construction makes the MCB-11B suitable for use with a broad selection of compatible ABB Modular pilot devices. Screw-clamp terminals simplify field wiring, while silver contacts and high mechanical durability support dependable operation throughout demanding industrial service.
Typical Applications
- Industrial pushbutton control circuits.
- Selector switch assemblies.
- Machine start and stop controls.
- Electrical interlocking circuits.
- Auxiliary control and signalling functions.
- Industrial operator stations and OEM control panels.
