The DEIF RMV‑D is a dual‑setpoint undervoltage relay designed to protect generators, motors, and transformers. It continuously monitors all three-phase voltages and triggers relay outputs when voltage drops below preset threshold levels. This sturdy module suits rugged industrial and marine environments.

Key Features:

Manufacturer: DEIF A/S, Denmark
Model / MPN: RMV‑D (undershoot, dual-level undervoltage) ()
Function: Dual-level undervoltage protection (U< + U<), ANSI code
Voltage Range: Adjustable setpoints from  – % of nominal voltage; suitable for  VAC,  VAC, etc.
Time Delay: – s front-panel adjustable
Hysteresis: Selectable –% of nominal voltage
Relay Outputs: SPDT contacts; rated  V AC @  A,  V DC @  A
Frequency Range: – Hz ()
Mounting:  mm DIN rail or panel (two screws). Weight approx. . kg
Insulation & Durability: Dielectric separation . kV; built-in  ms power-up/down delay for stable relay logic
LED Indicators: Yellow LED signals undervoltage threshold reached; red LED when trip is activated
Applications: Ideal for generator set, motor control, transformer protection in marine, power generation, industrial settings

DEIF – RMV-132D – Undervoltage Relay (Dual Setpoint) Generator/Motor Protection