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Protection & Control
Electromechanical / Single Function



Single Function Relay Products
  • Overcurrent, Synchronism Check, Voltage and Frequency, Differential, Directional, Timing, Distance, Generator, Breaker, Auxiliary
MVAX11 Tripping & Interposing Supervision Relay
  • Supervises the Trip Circuit
  • Continuous Monitoring
  • Visual Indication and alarm initiation
  • Robust and compact design
MVAX12 Supply Supervision Relay
  • Failure of Circuit Breaker Trip Supply
  • Ensures integrity of the protection scheme
  • Visual Indication and alarm initiation
  • Robust and compact design
MVAX21 Trip Circuit Supervision Relay (CB Closed only)
  • Circuit Breaker Trip Circuit supervision
  • Ensures integrity of the protection scheme
  • Visual Indication and alarm initiation
  • Robust and compact design
MVAX31 Trip Circuit Supervision Relay (CB Open or Closed)
  • Circuit Breaker Trip Circuit supervision
  • Open circuit trip coil or trip circuit wiring failure
  • Can be used with Pilot Wires
  • Visual Indication and alarm initiation
  • Robust and compact design
MVAX91 Trip Circuit Supervision Relay With Preclosing Supervision
  • Three Trip Circuit Supervision Relays in one case.
  • Simple and robust construction.
  • Ensures protection scheme integtrity
MMLB Test Plug
  • Facilitates Monitoring and Secondary Injection Test
  • Designed for 4mm stackable, retractable, shrouded plugs
  • Finger safe protection
  • Used with MMLG Test Module
MMLG Test Module
  • Provides Monitoring and Secondary Injection Test facilities
  • 14 independent circuits
  • Shorting links when used in Normal Service
  • Used with MMLB Test Plugs
PRIMA
  • Compact voltage auxiliary relay with optional test feature
  • Suitable for DIN, rack or panel mounting
  • Instantaneous or time delayed operation
MVAA13– One Unit, hand reset Auxiliary Relay
  • Voltage operated auxiliary Relay
  • Available in single (MVAA13) element models
  • Hand reset Contacts with optional flag indicator
  • Selection of standard and heavy duty contact configurations
  • Low Burden, Mechanically robust
MVAA16– One Unit, high Speed Self reset Auxiliary Relay
  • High Speed auxiliary relay
  • Voltage operated, low burden
  • Compact design
MVAA21– Two Units, self-reset Auxiliary Relay
  • Voltage operated auxiliary Relay
  • Available in single (MVAA11) or dual (MVAA21) element models
  • Self-reset Contacts with optional flag indicator
  • Selection of standard and heavy duty contact configurations
  • Low Burden, Mechanically robust
MVAA23– Two Units, hand reset Auxiliary Relay
  • Voltage operated auxiliary Relay
  • Available in dual (MVAA23) element models
  • Hand reset Contacts with optional flag indicator
  • Selection of standard and heavy duty contact configurations
  • Low Burden, Mechanically robust
MVAJ 05x/10x/20x – Tripping Relay High or Low Burden
  • Available with a wide range of features and configurations
  • Can be applied to all types of tripping schemes
  • Designed to directly operate circuit breaker trip coils
  • Highly reliable hinged armature construction
P991 – Test Block
  • Test module with provision for 14 circuits (cassettes)
  • Testing is simplified and quickly performed
  • CT short-circuiting is performed safely within the block
MBCI - Pilot Wire Line Differential Relay
  • Simultaneous tripping of relays at each line end
  • High stability for through faults
  • Fast operation for in zone faults
  • Low current transformer requirement
  • Peripheral Units; MCRI, MCTH, MRTP and MVTW relays; HN0068, ZC0243, ZC0244 pilot transformers
MCRI – Pilot Wire Line Differential Relay
  • Simultaneous tripping of relays at each line end
  • High stability for through faults
  • Fast operation for in zone faults
  • Low current transformer requirement
  • Peripheral Units; MCRI, MCTH, MRTP and MVTW relays; HN0068, ZC0243, ZC0244 pilot transformers
MVTP – Buswire Supervision Relay
  • Single and 3-phase Models for continuous Buswire supervision
  • Used in high impedance type Busbar protection schemes
  • Detects open-circuited Buswire as well as open-circuited main current transformers.
  • Integral Buswire shorting facility
MRTP Pilot Supervision and Injection Units
  • Used with MBCI relays
  • Suitable for pilot circuits insulated to 5kV, or 15kV with Pilot Injection Transformers
  • MRTP01 Pilot Supervision and Injection Filter Unit
  • MRTP02 Injection Filter Unit
  • MRTP03 Pilot Supervision Measuring Unit
MCTH - Transformer Inrush Detector
  • Allows MBCI to be used with Transformer Feeders
  • Detects and blocks operation during transformer Inrush conditions
MVTT Timing Relay
  • Ideal for alarm delays and to combat race problems in hard-wired scheme logic
  • Options for time delayed pick-up or drop-off applications.
  • Wide setting range and easy selection
  • Compact design and high flexibility
MVTW – Pilot Wire Destabilizing and Intertripping Relay
  • Trips the remote end when no current is present
  • Destabilizing the plain feeder protection so that tripping occurs
  • Intertrips by injecting AC Voltage into the pilot circuit
  • Used with MBCI main protection and Peripheral Units; MCRI, MCTH and MRTP ; HN0068, ZC0243, ZC0244 pilot transformers
MVAJ23 High Burden Tripping Relay
  • Cost-effective range of tripping and control relays.
  • Provides high-speed operation.
  • High and low burden alternatives are available.
MVAJ13 - Low Burden Tripping Relay
  • Cost-effective range of tripping and control relays.
  • Provides high-speed operation.
  • High and low burden alternatives are available.
MVAJ21 - High Burden Tripping Relay
  • Cost-effective range of tripping and control relays.
  • Provides high-speed operation.
  • High and low burden alternatives are available.