Demand Control Systems work intelligently to control a site’s load or period demand level to pre-set limits.

For those wanting a simpler load control capability, the DIN rail mountable B867 Over-Current Protection Unit may be suitable.

Custom load control solutions can also be supplied to help protect against circuit and transformer overload.

Over Current Protection

For those requiring a simple automated load control device, the DIN rail mountable B867 over current protection unit may be suitable.

• DIN rail mounted Over Current Protection.
• Protect circuits from overload to prevent damage or fuse/breaker activation.
• Load limit set to between 20% to 120% of nominal current.
• Single and three phase versions available.
• Operating time 2.5s at 2% over current limit but 0.1s if load hits 200% of limit.
• Single pole change over relay output (double pole option on single phase).
• Optional ‘release’ timer prevents reinstatement of tripped relay for set period.

Available in single or three phase versions, the B867 over-current device continuously monitors the ac current either directly (up to 5A) or via current transformers (for circuit currents >5A) and trips an internal relay when a preset current limit is breached.

The load limit is set via a simple dial to a percentage (between 20% & 120%) of the nominal current.
For example, if 100/5A CTs are used, the load limit may be set between 20% and 120% of 100A.