DEIF RMC‑111D Short‑Circuit Protection Relay

Technical Specifications

Model:RMC‑111D

Brand:DEIF

System compatibility:Uni‑line series short‑circuit protection relay,ANSI 50/51(I>> high‑set short‑circuit protection). Applied for generator short‑circuit fault protection,receives CT secondary current signal. Works with other Uni‑line synchroniser and load‑sharing units for complete genset protection solution. Only provides short‑circuit high‑current protection,does not include inverse‑time over‑current(I>),select RMC‑122D if I> function is required.

Function:Hardware‑based short‑circuit protection relay. Monitors three‑phase CT secondary current. Short‑circuit threshold adjusted by front‑panel potentiometer,setting range 100%‑400% of rated current. Trip delay T1 adjustable 0‑5 seconds. Output potential‑free trip relay contact when short‑circuit current exceeds threshold beyond delay time. LED indicators for power supply,fault detection and relay action status. No software configuration needed,all parameters set locally by potentiometers.

Installation:35 mm DIN‑rail mounting or base screw mounting inside switchgear cabinet

Interface:

‑Screw terminal:three‑phase CT current input

‑Potential‑free trip relay output terminals

‑Front‑panel potentiometers for I>> threshold and trip‑delay adjustment

‑LED status indicator lamps

Circuit feature:Analogue hardware protection logic,fast response time＜50ms,surge suppression for CT input terminals,relay contact transient protection,no firmware required.

Feature:Marine classification approved;relay contact rating 250VAC / 24VDC,8A resistive load. Distinguished from RMC‑122D:without inverse‑time over‑current I> protection function.

Diagnostic:Front‑panel LED reflects power supply,short‑circuit fault detection and relay tripping status.

Power supply:24VDC(18‑32VDC),typical power consumption 2W

Protection class:IP20

Horizontal operating temperature:‑25℃ ~ +70℃

Storage temperature:‑40℃ ~ +85℃

Relative humidity:5%‑95% non‑condensing

Shock & vibration:Complies with DNV marine environmental requirement

Weight:0.46kg

Dimensions:145mm ×110mm ×75mm

Certification:DNV,CE,marine type approval

Built‑in function

RMC‑111D short‑circuit relay detects severe short‑circuit fault current of generator. It outputs trip command to open generator breaker to protect generator winding from damage. Widely used for marine and industrial genset switchgear cabinets.

Product Brief

RMC‑111D belongs to DEIF Uni‑line series spare‑part family,hardware‑type short‑circuit(I>>) protection relay. It does not include inverse‑time over‑current protection. Potentiometer local setting without PC configuration tool. Widely applied for genset cabinet maintenance and renovation. ESD anti‑static protection shall be followed during installation.