Model Number Explanation

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

A: Standard card assembly

0330: High integrity 8‑channel SPCO relay card (7 alarm + 1 fault)

Technical Specifications

Relay Channels: 8 independent (7 configurable alarm, 1 dedicated fault)

Contact Type: SPCO (Single Pole Changeover) per channel

Contact Rating: 10 A @ 250 VAC (resistive)

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

Power Consumption: ~3.0 W

Isolation: Relay contacts isolated from system logic (galvanic)

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; SIL 2 compliant (IEC 61508)

Key Features

8 high‑integrity relays: 7 configurable alarm channels + 1 fail‑safe fault relay

Fail‑safe operation: Fault relay de‑energizes on card failure (safe state)

Configurable logic: Master alarm, individual channel, or mixed modes; adjustable on/off delays

High‑power contacts: 10 A rating for driving horns, beacons, ESD valves, and fans

Hot‑swap capable: Removable without disrupting other rack channels

LED status: Front‑panel LEDs for power, each alarm relay, and fault status

Applications

System Role: Safety‑critical relay output module for System 57 gas detection racks

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

Use Cases:

Emergency shutdown (ESD) master loops

High‑integrity alarm annunciation (beacons, horns)

Fault signaling to DCS/PLC (SIL 2 requirements)

Safety interlock and inhibit switching

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Legacy Status: Obsolete (EOL); available as refurbished/used stock

05701‑A‑0329 vs 0330

0329: 3‑Channel DPCO Relay Card – 3 × dual Form C contacts (general‑purpose, 5 A rating)

0330: 8‑Channel High Integrity SPCO Relay Card – 7 + 1 SPCO, 10 A, SIL 2, fail‑safe fault relay