Double-Pole Heavy-Duty Latching Relay

Engineered to be one of the most reliable relays on the market, the Double-Pole Heavy-Duty Latching Relay is suitable for all types of loads, including capacitor-corrected HID ballasts. A manual-operation lever and indicator are built in for convenient operation and status check at the panel.

Purchase Products

Product features

Built-In Dual Diode

  • Provides on/off signals.
  • Negative pulse turns relay on; positive pulse turns it off.
  • Allows AC signal to be rectified to turn relay on or off.
  • Acts as a gate for the switch signal in series with the relay coil.

Easy Wiring

  • Line-voltage leads conveniently color-coded.
  • All connections made with screw terminals.

Manual Lever Control

  • Provides a non-electrical method to check switching and status at the panel.

Industry Standard for Decades

  • Durable design reliably controls lighting and plug loads while prioritizing safety.
  • Mechanical latching requires no energy to maintain state.
  • Available with auxiliary contacts.
  • Two-wire connection provides command and reads relay status without using an input.


  • Works with all MACH‑ProLight™ models that have universal or relay outputs (MPL-XXU and MPL-XXR models).
  • Each relay supports up to six Douglas Lighting 8000 series switches. One switch controls up to four relays.

Manufacturer Warranty

  • 1 year.

Technical specifications

Supply Voltages

  • 20 A at 120/277/347/480 VAC.
  • Auxiliary contact: 1 A, 125 VAC.

Contact Ratings

  • Auxiliary contact: 1 A, 125 VAC.
  • UL Listings:
    • 20 A 480 VAC General Use.
    • 2,400 W 120 VAC Tungsten.
    • 20 A 480 VAC Ballast.
  • CSA:
    • 20 A 347 VAC General Use.
    • 2,400 120 VAC Tungsten.
    • 20 A 347 VAC Ballast.

Control Input

  • Class 2 circuit.
  • 350 mA momentary pulse.
  • 24 V reversible polarity pulse.
  • Wiring terminal: 16–20 AWG (1.5–0.75 mm2).

Control Output

  • Allows more than 60,000 operations with 20 A load, 2,000 A inrush at 20 times minimum switch speed.
  • Wiring terminal: 10–14 AWG (6–2.5 mm2).


  • Suited for indoor, stationary, non-corrosive environment with noncondensing humidity.


  • 9.7 cm W x 2.5 cm H x 6 cm D
    (3 13/16" W x 1" H x 2 3/8" D).

Ambient Limits

  • Operating: 15°C to 120°C (-10°F to 50°F).


  • Snap-rail mountable.


  • UL
  • CSA.


Application diagram

Wiring diagram