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Single Function Relay Products
- Overcurrent, Synchronism Check, Voltage and Frequency, Differential, Directional, Timing, Distance, Generator, Breaker, Auxiliary
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MVAX11 Tripping & Interposing Supervision Relay
- Supervises the Trip Circuit
- Continuous Monitoring
- Visual Indication and alarm initiation
- Robust and compact design
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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
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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
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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
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MVAX91 Trip Circuit Supervision Relay With Preclosing Supervision
- Three Trip Circuit Supervision Relays in one case.
- Simple and robust construction.
- Ensures protection scheme integtrity
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MMLB Test Plug
- Facilitates Monitoring and Secondary Injection Test
- Designed for 4mm stackable, retractable, shrouded plugs
- Finger safe protection
- Used with MMLG Test Module
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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
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PRIMA
- Compact voltage auxiliary relay with optional test feature
- Suitable for DIN, rack or panel mounting
- Instantaneous or time delayed operation
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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
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MVAA16– One Unit, high Speed Self reset Auxiliary Relay
- High Speed auxiliary relay
- Voltage operated, low burden
- Compact design
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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
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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
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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
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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
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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
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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
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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
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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
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MVAJ23 High Burden Tripping Relay
- Cost-effective range of tripping and control relays.
- Provides high-speed operation.
- High and low burden alternatives are available.
- MVAJ23 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ053 or MVAJ103.
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MVAJ13 - Low Burden Tripping Relay
- Cost-effective range of tripping and control relays.
- Provides high-speed operation.
- High and low burden alternatives are available.
- MVAJ13 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ053 or MVAJ103.
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MVAJ21 - High Burden Tripping Relay
- Cost-effective range of tripping and control relays.
- Provides high-speed operation.
- High and low burden alternatives are available.
- MVAJ21 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ051 or MVAJ101.
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MVAW02 Low Burden Inter-trip Relay
- Interposing Relay in Distance Schemes using rented pilots.
- Low Burden, Multi Contact Receive/Follower Relay.
- Robust Attracted Armature Design.
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MVAW11/13 Interposing Relay
- Single unit.
- Remote control of Circuit Breakers via long pilot wires.
- Insensitive to ac induced voltages.
- Option of self reset or hand reset contacts.
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MVAW21 Interposing Relay
- Dual unit.
- Remote control of Circuit Breakers via long pilot wires.
- Insensitive to ac induced voltages.
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MVUA11 Auxiliary Relay with fixed time delay
- DC voltage operated auxiliary and tripping relay with a fixed time delay
- Standard or Heavy duty, Self Reset Contacts
- Option for Time delay on Pickup or Reset
- Compact design
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MVAJ25 High Burden Tripping Relay with Hand/Electrical Reset Contacts
- Option of 4 or 9 contacts with or without Flag indicator
- High Burden Operation
- Instantaneous Cut Off Contact
- MVAJ25 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ055 or MVAJ105.
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MVAJ11 Low Burden Tripping Relay (Self Reset Contacts)
- 5 or 10 Self Reset Contacts
- Instantaneous Economy Cut Off Contact
- Low Burden Operation
- Compact design
- MVAJ11 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ051 or MVAJ101.
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MVAJ14 Low Burden Control Relay (Electrically Reset Contacts)
- 5 or 10 Electrically Reset Contacts
- Instantaneous Cut Off
- Low Burden Operation
- Compact design
- MVAJ14 is under last-time buy. Orders may be placed until 15th August 2025 and will be fulfilled based upon availability. As an alternative, please refer to MVAJ055 , MVAJ104 or MVAJ105.
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MCAA Current Operated Auxiliary Relay
- Current operated auxiliary Relay
- Options for Self Reset, hand Reset or Self/Hand Reset Contacts
- Options for single or double unit
- Connected with MVAJ relays for Series Repeat Application
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MVAP22 Voltage Selection and Supply Supervision Relay
- Detects voltage circuit failure
- Switches to alternative mains supply
- Visual Indication and alarm initiation
- Robust and compact design
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MVAZ04 Protection In/Out Relay
- Suitable wherever local or remote switching is required
- Contacts latched in either direction
- Ac or Dc Operated
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MMLZ Range of Auxiliary Modules
- Fully compatible with other MIDOS products
- Suitable for rack or panel mounting
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