Delta Series: Trip, Auxiliary and Supervision

The Delta relays provides a robust and reliable interface between protection and control system circuits. A more economical alternative to traditional auxiliary, trip and supervision relays, the Delta provides a compact, flexible and high performance solution while meeting relevant IEC standards.
A wide voltage range and standard hand reset flag reduces the number of model variations.
The Delta range is packaged in a size 2, 2U high case that may be flush panel, rack or rail mounted. A plug in terminal block is provided to allow panel pre-wiring. Where more than 4 contacts are required refer to the Alpha Range Technical Bulletin.
  • Delta ARD4 Compact electro-mechanical auxiliary relays

    Read more The Delta ARD4 relay provides a robust and reliable interface between protection and control system circuits. A more economical alternative to traditional auxiliary relays, the Delta ARD4 provides a compact, flexible and high performance solution while meeting relevant IEC standards. A wide voltage range and standard hand reset flag reduces the number of model variations. The Delta range is packaged in a size 2, 2U high case that may be…
  • Delta TRD4 Compact electro-mechanical tripping relays

    Read more The Delta TRD4 is a high speed, high burden electro-mechanical tripping relay for power utility protection and control applications. The TRD4 is built on the Delta relay platform providing high performance and reliability while reducing production and supply lead times. Application of the Delta TRD4 multi-contact high-speed trip relays ensures fast operation of less than 10 ms. The Delta TRD4 relay provides a robust and reliable high speed interface between…
  • Delta XRD Compact supervision relay

    Read more The Delta XR Series Relays are low burden electro-mechanical supervision relays for application on high security tripping and auxiliary supply circuits. The Delta XR relays have been designed to provide a balance of low burden to minimize the possibility of circuit breaker maloperation while maintaining a minimum contact whetting current to avoid nuisance alarm conditions. A key feature of the design is a high visibility flag indicator that can only…
  • Delta XRD-8 Trip Circuit Supervision Relay

    Read more The Delta XRD-8 has been designed to specifically operate with magnetic actuated circuit breaker control modules. Supervision currents have been chosen to ensure reliable differentiation between supervised and tripped conditions. A green Healthy LED is standard. Failure of the circuit or supply being supervised will cause the main relay element to drop out, an alarm signalled via the red LED and the alarm contacts to change state. The Delta range…
  • Delta-Flex

    Read more Modular auxiliary relay system Delta-Flex Auxiliary • Tripping • Timing • Arc fault The Delta-Flex system provides a flexible and cost effective method to mount and wire a wide range of auxiliary relays on protection panels. Features 2U high 19-inch rack or flush mounting Wide range of auxiliary relay functions Specify components or complete sub-rack system M4 screw terminals suitable for ring lugs Integrated front panel covers • Custom panel labelling…