Series-782

Supported Applications

The Dwyer Series 781 & 782 Ice Cube Relays are full-featured electromechanical relays designed for AC or DC circuits. Documented applications include refrigeration compressor systems, HVAC motor controls, and water/wastewater pump control.

Operating Conditions & Performance

The series operates within an ambient temperature range of -40 to 131°F (-40 to 55°C) with a storage limit of -40 to 185°F (-40 to 85°C). Electrical ratings vary by model and standard: Series 782 models are rated for 15 A @ 120 VAC 50/60 Hz; 12 A @ 277 VAC 50/60 Hz or 28 VDC (UL); and 10 A @ 277 VAC 50/60 Hz (CSA). Series 781 models are rated for 15 A @ 277 VAC (50/60 Hz) or 28 VDC. The relays feature silver alloy plug-in contacts and a cycle life of 100,000 cycles (electrical) and 10,000,000 cycles (mechanical). Power consumption is listed as 781: 0.9 VA; 0.7W; 782: 1.2 VA; 0.9W.

Compliance

• CE, CSA, cULus, cURus

Configuration Options

The Series 781 & 782 are socket-mounted for quick installation and replacement. The housing is constructed of plastic polycarbonate with a clear design to allow easy viewing of contacts.

Status Indicators & Controls

• Flag status indicator
• LED status lamp for visual confirmation of relay state
• Push-to-test button (color-coded to differentiate between AC and DC actuated models)
• Removable lock-down lever holds the test button in place

Electrical Configuration

The series supports switching operations of SPDT or DPDT. Input voltages include 24 VAC, 120 VAC, and 240 VAC (50/60 Hz) for AC models, and 24 VDC for DC models.

Accessories

• 70-781D5-1A: Socket for 781 series relay
• 70-782D8-1A: Socket for 782 series relay

Dimensions & Weight

• Series 781: 1-19/32 [40.60] x 35/64 [14.00] x 1-3/32 [27.09]; Weight: 1.02 oz (29 g)
• Series 782: 53/64 [21.00] x 1-3/32 [27.90] x 1-17/32 [39.10] with 19/64 [7.37] x 1/64 [0.50] x 3/16 [4.75] socket; Weight: 1.3 oz (36 g)

Key Product Differences

The series is divided into two primary model families with distinct electrical ratings and physical dimensions:

• Series 781: SPDT switching operation. Rated for 15 A @ 277 VAC (50/60 Hz) or 28 VDC.
• Series 782: DPDT switching operation. Ratings differ by standard: UL rated at 12 A @ 277 VAC 50/60 Hz or 28 VDC; CSA rated at 10 A @ 277 VAC 50/60 Hz.

Model numbers follow the pattern 781XAXRM4L-<VOLTAGE> for Series 781 and 782XBXRM4L-<VOLTAGE> for Series 782, with voltage suffixes indicating AC or DC input (e.g., -24A, -24D).