Overview

The Vimar VM01971 is a 4-relay DIN-rail actuator for low-voltage switching on board, giving you four independent change-over relay outputs (10 A) controlled through a By-me Plus bus installation. It accepts 12-24 V~ (50-60 Hz) or 12-24 V d.c. (SELV) and is intended to live inside an electrical panel where you can keep wiring tidy and serviceable.

On a boat, this is typically used to bring automation commands into real-world loads like lighting circuits, courtesy lights, solenoid valves, or other 12/24 V auxiliaries that you want to control from By-me Plus keypads, scenarios, or a central controller. Each relay is handled as its own functional block, so you can group outputs and store scene states without tying everything to one circuit.

It mounts on an EN 50022 rail and takes up 6 modules of 17.5 mm each. With IP20 protection, plan on installing it in a dry, protected enclosure away from direct washdown or spray. The housing is grey RAL 7035.

Key features

• Four change-over relay outputs rated 10 A for 12/24 V loads, including resistive loads, incandescent lamps, and LED spot lamps (20,000 cycles).
• Supply input: 12-24 V~ ±10% (50-60 Hz) or 12-24 V d.c. ±10% (SELV).
• By-me bus connection with rated bus supply voltage of 29 V for control and configuration within a By-me Plus system.
• Panel-friendly footprint: DIN rail installation on EN 50022 rail, occupying 6 x 17.5 mm modules.
• Local configuration button with per-relay green LEDs and a red status LED for commissioning and troubleshooting at the panel.
• Selectable relay behavior and timing options, including stable modes plus on and off delays.
• Tested for marine-relevant stresses including cyclic salt mist (IEC 60068-2-52) and vibration (IEC 60068-2-6).
• EMC conformity to EN 50428 and EN 55025 for cleaner integration alongside other onboard electronics.

Electrical and system integration

Power the unit with either 12-24 V AC or 12-24 V DC within the allowed tolerance, then connect it to the By-me Plus bus for control logic. Typical current draw depends on supply: 400 mA at 12 V~ (or 230 mA at 12 V d.c.) and 240 mA at 24 V~ (or 120 mA at 24 V d.c.).

Each output is a dedicated relay channel, which keeps it straightforward to split functions by circuit, by cabin zone, or by operational mode. The actuator can be assigned to scenarios and can store a relay state to be recalled when a scenario is triggered.

Installation and setup

Allow space on the DIN rail for a 6-module device and leave room for wiring bend radius and labeling. Because the enclosure protection is IP20, it belongs inside a proper panel or DIN housing where it stays out of bilge humidity, salt spray, and washdowns.

During commissioning, the front button and LEDs let you select the relay channel being configured and confirm status at a glance. Use appropriate circuit protection for the loads being switched and keep wiring practices consistent with the rest of the boat’s distribution system.

Load planning and onboard use

The 10 A rating makes it a solid fit for switching common 12/24 V circuits such as lighting runs or small auxiliaries. For motors, compressors, or other loads with high inrush, it is often cleaner to use the relay output to drive a suitably rated contactor, keeping heavy current out of the automation cabinet wiring.

This actuator is a good match for boats already built around a By-me Plus automation backbone where you want centralized, panel-based switching without scattering separate relays around the vessel.