Delta XRD3 Compact high-performance relay

Features

• Continuous supervision of trip circuit independently of the circuit breaker position
• Alarming delay to mask circuit‑breaker operations
• Operation‑state indication by green LED (healthy) and red LED (failure alarm)
• Low‑level measuring current allows use in sensitive or high‑resistance circuits
• Trip supply source supervision
• Wide range of nominal DC voltages
• Galvanic isolation possible between auxiliary source and supervised circuit
• Very low burden
• Continuous contact current up to 10 A
• Ability to see the relay switching and state of the contacts
• Operating altitude < 2000 m
• No problem to continuously energize relay in worst‑case conditions (temperature, voltage)
• No maintenance necessary during lifetime of the relay
• Compact and sturdy design
• Easy to insert/extract from socket without tools
• No need for external fastening when inserted in socket
• A 3‑phase trip circuit supervision relay

Description

The XRD3 provides trip‑circuit supervision for single‑pole circuit breakers equipped with three trip coils. The trip circuits are monitored from the positive supply to the negative supply while the circuit breaker is in either the open or closed position. Supervision is carried out using a low supervision current in each circuit, preventing unwanted operation of the trip coil. Healthy circuits are indicated by a green LED, while a red LED signals a failed trip circuit.