ABB NMTU-21C Multi-Function Communication

Termination for up to sixteen (16) analog I/O process signals within a horizontal row.

All SD I/O modules & bases of all types (Singular or Redundant) AND (Compact or Full-size), are 100% fully compatible with each other. 

Thus, Singular & Redundant, Compact or Full-size I/O modules can be mounted within a single, common HN800 I/O bus.

Optional mechanical keying can be implemented to prevent insertion of the wrong I/O module type.

Latching device on the base locks the base into position on DIN-Rail.

Industry standard 35-mm DIN rail, Horizontal row mounting.

Furthermore, the anti-pumping device only allows circuit-breaker closure if the following conditions 

are present at the same time:

 1. Closing spring fully charged

 2. Opening mechanical pushbutton and/or opening release coils (-MO1/-MO2) are not active.

 3. The circuit breaker is in the Open position.

Current limitation

ABB's utilization of current limiting circuit breakers

brings a whole new level of protection and peace of

mind to the distribution of electrical power on the

data center floor. Two of the most notable benefits

of current limitation are increased protection for

downstream system components and the

mitigation of arc flash hazard for workers. Both

mechanical and thermal forces are drastically

reduced through current limitation, which in a data

center, means less potential damage or strain on

the sensitive and expensive IT equipment. This

heightened protection helps remove worries of

extended downtime due to repairs or replacing of

damaged equipment. Current limitation is also the

driving factor to reducing the energy released

during an arc flash event.