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Electronic overload relays

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article image The Allen-Bradley E1 Plus electronic overload relay.

ROCKWELL Automation is distributing the new Allen-Bradley E1 Plus electronic overload relays. The relays deliver versatility and high-performance motor protection in a rugged design that is easy to install, operate and maintain.

Offered in both IEC and NEMA configurations, the E1 Plus relays are self-powered and incorporate direct contactor mounting, simplifying installation and operation. The relays provide great application flexibility, with standard AC15 utilisation-rated normally open and normally closed isolated contacts.

Thermal modeling in the E1 Plus is carried out via its precision solid-state components, which includes an application-specific integrated circuit (ASIC). The ASIC continually processes motor current data to accurately maintain the time-current status of motor loading. A thermal memory circuit in the E1 Plus allows it to model the thermal effects of motor on and off periods, ensuring accurate protection of both hot and cold motors.

The E1 Plus relays also deliver reliable, highly responsive phase loss protection, with a dedicated phase loss detection circuit. The typical phase loss reaction time for the E1 Plus is three seconds. Traditional overloads can take up to 40 seconds.

Insert moulded power connections provide a sturdy two-component starter assembly, with contactor-to-overload interconnection further enhanced by a base latching mechanism. Mounting the overload relays with the relay base flush to the contactor base results in improved starter stability.

Featuring a 5:1 full load current (FLA) setting range, a single relay spans the range of up to four bimetallic devices. The wider adjustment range means fewer current ranges and greater installation flexibility. The EE version offers DIP switch settings for trip class (10, 15, 20 or 30) and reset mode (manual or automatic/manual), resulting in one device with six possible operation modes.

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