Device Features
The AUR381Z relays are designed for monitoring 3(N)AC systems for asymmetry, undervoltage, and phase failure without requiring an external supply voltage. Key features include adjustable response values (5-15% for asymmetry and 0.7-0.95 x Un for undervoltage), a response delay of 0.5-5 seconds, and alarm indicators.

Product Description
The relays operate by de-energizing the alarm relay when asymmetry or undervoltage exceeds set thresholds. They include special input transformers to reduce system interference and an integrated protective circuit for systems with interferences.

Typical Applications
These relays are suitable for monitoring the power supply of motors or electrical installations and asymmetrically loaded systems.

Technical Data
Key specifications include a rated insulation voltage of AC 630 V, a frequency range of 50-60 Hz, and a power consumption of ≤ 5 VA. The relays have a switching element with two changeover contacts and an electrical endurance of 12,000 cycles.

Environmental and EMC Standards
The relays comply with EMC immunity and emission standards (IEC 61000-6-2 and IEC 61000-6-4) and have specified shock and vibration resistance. They operate within an ambient temperature range of -10 to +50 ºC.

Connection and Mounting
Connections are made via flat terminals with self-lifting clamp washers, supporting both single wire and flexible wire with end ferrules. The relays can be mounted in any position and comply with IP30 protection for internal components.

Ordering Information
The relays are available for various nominal system voltages, including 100 V, 110 V, 400 V, 440 V, 500 V, and 690 V. An energy backup (SP100) is available as an accessory to maintain delay functions during complete system failures.

Additional Information
For detailed installation and operation instructions, refer to the operating manual BP302003. The relays are manufactured by Bender GmbH & Co. KG, Germany.