Wattstopper LMRC-211: The Single-Relay DLM Room Controller, Explained

Wattstopper LMRC-211: The Single-Relay DLM Room Controller, Explained

The Wattstopper LMRC-211 is one of the most-specified parts in a Legrand Digital Lighting Management (DLM) system. If you're building a code-compliant lighting-control room and you see "LMRC-211" on the schedule, this is the load controller doing the switching and dimming. This page covers exactly what the LMRC-211 is, its verified specs, and where it fits in a DLM room.

What is the LMRC-211?

The LMRC-211 is a single-relay digital room controller with 0-10V dimming, part of Wattstopper's LMRC-210 Series. It's the foundation of a DLM room: it switches the lighting load on and off, dims it through a 0-10V output, and connects to DLM occupancy sensors, daylighting sensors, and digital wall switches over plug-and-play low-voltage cabling.

In a DLM system the room controller is the hub. Sensors and switches plug into it with pre-terminated Cat 5e cables, and the controller distributes low-voltage power and data to those devices while it handles the line-voltage load.

LMRC-211 verified specifications

These are confirmed against Legrand's LMRC-211 documentation:

  • Relays: 1 (single relay). The LMRC-210 Series spans one, two, or three relays; the LMRC-211 is the one-relay model.
  • Dimming: one 0-10V (0 to 10 VDC) output per relay, for control of dimmable LED drivers and electronic ballasts (Advance Mark 7 or equivalent).
  • Voltage: 120/277 VAC, 50/60 Hz.
  • Switching capacity: 20 A.
  • Compatible loads: electronic ballast, CFL, LED and LED lamps, incandescent, and motor loads (UL/CUL listed under UL 60730 as a Type 1 operating control).
  • Plenum rating: UL2043 plenum approved, suitable for use in air-handling spaces (above-ceiling plenums).
  • Low-voltage power: provides low-voltage power to DLM devices over Cat 5e cable (LMRJ), 800 mA maximum.
  • Operating temperature: 32° to 158°F (0° to 70°C).
  • Storage temperature: 23° to 176°F (-5° to 80°C).
  • Relative humidity: 5 to 95%, non-condensing.
  • Dimensions: 6-1/2 in L x 6-1/2 in W x 2-5/8 in H.
  • Mounting: surface mount (above ceiling / on the fixture or junction box).

How the LMRC-211 works in a DLM room

DLM is built to be wired without a programmer for basic operation. The LMRC-211 has RJ-45-style DLM ports; you connect occupancy sensors, daylight sensors, and digital switches with standard pre-made Cat 5e DLM cables, and the system auto-configures common behavior out of the box. From there it can be fine-tuned with a configuration tool or push-button setup.

That plug-and-play wiring is the practical reason DLM gets specified: an electrician can land the line-voltage load on the controller and snap in the low-voltage devices without home-running everything to a panel.

What the LMRC-211 controls

A single LMRC-211 manages one lighting zone: one relay for on/off, with continuous 0-10V dimming on that zone. For rooms that need multiple independently dimmed zones, the same series steps up to the two-relay and three-relay controllers (LMRC-212 and LMRC-213), which carry the same wiring and dimming approach with more zones per device.

Where the LMRC-211 fits for Title 24 and energy code

DLM room controllers, paired with DLM occupancy/vacancy sensors and daylight sensors, are a common way to meet commercial lighting-control requirements such as automatic shutoff, multilevel/continuous dimming, and daylight response. The LMRC-211's 0-10V output supports the continuous-dimming behavior these codes call for, and its DLM ports accept the sensors that handle automatic shutoff and daylighting. For how those requirements work in California, see our Title 24 daylighting requirements guide and our explainer on 0-10V dimming.

Common LMRC-211 variants

  • LMRC-211: the standard 120/277V single-relay room controller with 0-10V dimming.
  • LMRC-211-347: a 347V version for Canadian and 347V commercial systems.
  • LMRC-211-U: the UL-listed catalog variant Legrand lists for the U.S.

Confirm the exact catalog number and voltage for your job before ordering, since 277V and 347V parts are not interchangeable.

Buy the LMRC-211 from Rock

Rock Lighting & Electric is an authorized Wattstopper / Legrand dealer and distributor. We stock DLM room controllers, sensors, and digital switches and quote them at contractor pricing, with nationwide shipping. Browse the Wattstopper collection, see the matching sensors in our commercial occupancy sensor buying guide, or send us your control schedule and we'll quote the full DLM package.

FAQ

What is the Wattstopper LMRC-211?
It's a single-relay Digital Lighting Management (DLM) room controller with 0-10V dimming. It switches and dims one lighting zone and connects to DLM occupancy sensors, daylight sensors, and digital switches over plug-and-play Cat 5e cabling.
What voltage and load does the LMRC-211 handle?
120/277 VAC, 50/60 Hz, rated for 20 A switching. It controls LED, electronic ballast, CFL, incandescent, and motor loads.
Does the LMRC-211 do 0-10V dimming?
Yes. It provides one 0-10V (0 to 10 VDC) dimming output on its relay for control of dimmable LED drivers and electronic ballasts.
Is the LMRC-211 plenum rated?
Yes. It's UL2043 plenum approved, so it can be installed in air-handling spaces above the ceiling.
What's the difference between the LMRC-211, LMRC-212, and LMRC-213?
The number of relays (lighting zones). The LMRC-211 has one relay, the LMRC-212 has two, and the LMRC-213 has three. All are part of the LMRC-210 Series and share the same DLM wiring and 0-10V dimming approach.
Is there a 347V version of the LMRC-211?
Yes, the LMRC-211-347 is the 347V variant for Canadian and 347V commercial systems. Confirm voltage before ordering.

Specifications can change. Confirm current LMRC-211 ratings, voltage, and listings against Legrand's official spec sheet before finalizing a design.

Back to blog