Model Number Explanation

05701: System 57 / 5701 series (Sieger gas detection system)

A: Standard card assembly

0329: Triple DPCO relay card (3‑channel, dual‑pole changeover)

Technical Specifications

Relay Channels: 3 independent channels

Contact Type: Dual Form C (SPDT) per channel (DPCO)

Contact Rating: 5 A @ 250 VAC / 30 VDC (resistive)

Power Supply: 18–32 VDC (nominal 24 VDC, from rack backplane)

Power Consumption: ~2.5 W

Isolation: Relay contacts isolated from system logic

Terminals: Screw terminals (max 2.5 mm² / 14 AWG) for field wiring

Operating Temperature: −40°C to +70°C

Form Factor: 3U rack‑mount card (19” subrack)

Dimensions: 112 × 25 × 102 mm (L×W×H)

Weight: ~0.165 kg

Certifications: CE marked; meets Honeywell safety & EMC standards

Key Features

Three DPCO relays: Each channel has two Form C contacts for redundant or multi‑path switching

Alarm/fault signaling: Drives external annunciators, PLC inputs, or shutdown devices

Hot‑swap capable: Removable without disrupting other rack channels

LED status: Front‑panel LEDs for power and each relay’s active state

Backplane integration: Receives control signals from System 57 control cards

Applications

System Role: Relay output module for System 57 gas detection racks

Industries: Oil & gas, petrochemical, power generation, hazardous area safety

Use Cases:

Gas detection alarm annunciation (beacons, horns)

Fault signaling to remote PLC/DCS

Safety inhibit or interlock switching

General‑purpose dry‑contact output for industrial control

Compatibility & Replacement

System Compatibility: Honeywell System 57 (5701 series 19” subracks)

Control Card Compatibility: 05701‑A‑0301 / 0302 / 0326

Replacement Type: Direct drop‑in replacement

Legacy Status: Obsolete (EOL); available as refurbished/used stock

Quick Comparison (0325 / 0326 / 0329)

0325: DC Input Card – 24 VDC power supply for the entire rack

0326: Field Interface Card – 1‑channel input for gas detectors

0329: Relay Output Card – 3‑channel DPCO relay outputs for alarms