Moeller launches contactor monitoring device
A
Moeller Electric product story
Edited by the Engineeringtalk editorial team
Apr 20, 2009
Moeller Electric has introduced a contactor monitoring device (CMD) that safely and reliably eliminates the need for a redundant contactor typically found in safety and mission-critical applications.
In processes such as these, redundant contactors are often required to prevent operation failure, even when the primary contactor encounters a fault such as welded contacts.
According to the company, a common method to satisfy this requirement is to install a second contactor.
This method requires a significant amount of additional panel space and cost, particularly with larger contactors.
Moeller's CMD continuously monitors a single contactor and trips an upstream circuit breaker when welded contacts are detected - a common fault when a contactor nears the end of its life cycle.
The CMD can work in concert with the advanced design of Moeller's contactors, taking full advantage of positively driven auxiliary contacts that conform to IEC EN 60947-4-1 Annex F as mirror contacts.
Mirror contacts allow the CMD to determine a fault by comparing the control voltage and the state of the main contacts of the contactor.
When a fault is detected, the CMD's relay output switches off the upstream circuit breaker via an under-voltage trip.
The CMD is approved for use in emergency-stop applications, under EN 60204-1, and conforms to safety categories three and four of EN 954-1.
The devices are DIN-rail mountable and are 22.5mm wide.
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