The Type HEA high-speed multicontact, auxiliary relays are applicable where it is desired that a number of operations be performed simultaneously from the operation of a single relay.

Features and Benefits
  • Electrically separate outputs available
  • Various shaft lengths available
  • Locks equipment out of service
Applications
  • Contact multiplication
Protection and Control
  • Trip and/or block close breaker control

HEA Multicontact Auxiliary Relay

The Type HEA high-speed multicontact, auxiliary relays are applicable where it is desired that a number of operations be performed simultaneously from the operation of a single relay.

Features and Benefits
  • Electrically separate outputs available
  • Various shaft lengths available
  • Locks equipment out of service
Applications
  • Contact multiplication
Protection and Control
  • Trip and/or block close breaker control

This high-speed protection for feeders is based on the Merz-Price circulating current system. It is suitable for the majority of plain feeders and provides a single-phase current for comparison over a pilot circuit.

Merz-Price circulating system, single-phase current

MHOR04 is based on the Merz-Price circulating current system. It is operational over privately owned two-core pilots with a relatively high core resistance (up to 1000O loop) level and a low intercore insulation level

MHOR04

Line differential and phase comparison

This high-speed protection for feeders is based on the Merz-Price circulating current system. It is suitable for the majority of plain feeders and provides a single-phase current for comparison over a pilot circuit.

Merz-Price circulating system, single-phase current

MHOR04 is based on the Merz-Price circulating current system. It is operational over privately owned two-core pilots with a relatively high core resistance (up to 1000O loop) level and a low intercore insulation level

MBCI, MCRI and MRTP under last time buy. Orders may be placed until 27th January 2027 and will be fulfilled based upon availability.

Differential feeder protection requires a comparison of the currents entering and leaving the protected zone.

MBCI, MCRI, MRTP AND MVTW – Legacy

Differential Feeder

MBCI, MCRI and MRTP under last time buy. Orders may be placed until 27th January 2027 and will be fulfilled based upon availability.

Differential feeder protection requires a comparison of the currents entering and leaving the protected zone.

The MMLZ range of modules consists of various non-protective devices that have been accommodated in standard Midos cases. The modules, each of which has been designed for a specific purpose, are fully compatible with the Midos range.

MMLZ

Auxiliary Modules

The MMLZ range of modules consists of various non-protective devices that have been accommodated in standard Midos cases. The modules, each of which has been designed for a specific purpose, are fully compatible with the Midos range.

The MVAX relay supervises trip circuiting of circuit breakers and initiates audible alarms and visual indications if the trip circuit fails or the mechanism ceases to operate.

The MVAX trip circuit supervision relays can be applied to monitor circuit breaker tripping circuits. They are compact in design and have a user-friendly interface.

MVAX 12, 21, 31, 91

Trip Circuit Supervision

The MVAX relay supervises trip circuiting of circuit breakers and initiates audible alarms and visual indications if the trip circuit fails or the mechanism ceases to operate.

The MVAX trip circuit supervision relays can be applied to monitor circuit breaker tripping circuits. They are compact in design and have a user-friendly interface.

The type MVAX 11 relay supervises the trip circuit of tripping relays such as the MVAJ or the interposing control relay type MVAW.

The MVAX 11 relay constantly monitors the trip circuit of tripping relays. It is compact and robust in design, has a positive action and no chatter.

MVAX 11

Tripping and Interposing Supervision

The type MVAX 11 relay supervises the trip circuit of tripping relays such as the MVAJ or the interposing control relay type MVAW.

The MVAX 11 relay constantly monitors the trip circuit of tripping relays. It is compact and robust in design, has a positive action and no chatter.

The type MVAW relay is intended for remote control of switchgear and associated equipment via long pilot wires. The relay will not operate on induced ac voltages, and its high pick-up current enables it to be used with anti-corrosion negative potential biasing devices.

Three versions suitable for a wide voltage range

Suitable for a wide voltage range, the MVAW comes in self reset (MVAW11 - 1 element or MVAW21 - 2 elements) or manual reset (MVAW13) versions.

Its compact design and positive action are enhanced with a high degree of mechanical stability.

MVAW

Interposing Relays

The type MVAW relay is intended for remote control of switchgear and associated equipment via long pilot wires. The relay will not operate on induced ac voltages, and its high pick-up current enables it to be used with anti-corrosion negative potential biasing devices.

Three versions suitable for a wide voltage range

Suitable for a wide voltage range, the MVAW comes in self reset (MVAW11 - 1 element or MVAW21 - 2 elements) or manual reset (MVAW13) versions.

Its compact design and positive action are enhanced with a high degree of mechanical stability.

The MVAP 22 is essentially a fuse failure relay with changeover output contacts enabling it’s use for either voltage selection or fuse failure protection. A typical application as a voltage selection relay is the automatic connection of metering equipment to an alternative supply if the normal or preferred supply fails. As a fuse failure relay, it will monitor the output of a voltage transformer and give an alarm or disconnect protection circuits for VT fuse failure.

MVAP 22

Voltage Selection/Fuse Failure Relays

The MVAP 22 is essentially a fuse failure relay with changeover output contacts enabling it’s use for either voltage selection or fuse failure protection. A typical application as a voltage selection relay is the automatic connection of metering equipment to an alternative supply if the normal or preferred supply fails. As a fuse failure relay, it will monitor the output of a voltage transformer and give an alarm or disconnect protection circuits for VT fuse failure.

PRiMA relays are ruggedized and specifically designed to be part of large scale electrical fixed installations, where robustness, reliability and compliance with substation norms are paramount. PRiMA auxiliaries are versatile plug-in relays with up to four pairs of output contacts. The space efficient design allows mounting in any location within a cubicle or panel, whether front or back of panel, DIN rail, etc. Typical applications are for general contact multiplication, interlocking, volts/no volts indication and other annunciation.

PRiMA Plug-in Auxiliary Relays

PRiMA relays are ruggedized and specifically designed to be part of large scale electrical fixed installations, where robustness, reliability and compliance with substation norms are paramount. PRiMA auxiliaries are versatile plug-in relays with up to four pairs of output contacts. The space efficient design allows mounting in any location within a cubicle or panel, whether front or back of panel, DIN rail, etc. Typical applications are for general contact multiplication, interlocking, volts/no volts indication and other annunciation.

The MVAJ range consists of highly reliable hinged armature relays designed to directly operate circuit breaker trip coils. Built to very high specifications, the MVAJ range provides an extremely flexible and reliable link between the protective relays and the circuit breakers.

MVAJ 05x/10x/20x Trip Relays

High-speed tripping and control relays

The MVAJ range consists of highly reliable hinged armature relays designed to directly operate circuit breaker trip coils. Built to very high specifications, the MVAJ range provides an extremely flexible and reliable link between the protective relays and the circuit breakers.