Description
Honeywell 05701-A-0330 System 57 High Integrity Relay Card
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 05701-A-0330 |
| Manufacturer | Honeywell Analytics |
| System | System 57 |
| Associated Controller | 5701 Control System |
| Card Type | High Integrity Relay Card |
| Relay Configuration | Double SPCO |
| Number of Relays | 8 |
| Configurable Relays | 7 |
| Fault Relay | 1 |
| Relay Contact Rating | 5 A at 250 VAC / 32 VDC, non-inductive |
| Relay Operation | Selectable latching/non-latching |
| Energization | Selectable normally energized/de-energized |
| Terminal Capacity | Up to 2.5 mm² / 14 AWG |
| Power Consumption | Approx. 1.7 W |
| Operating Temperature | -5°C to +55°C |
| Storage Temperature | -25°C to +55°C |
| Operating Humidity | 20–99% RH, non-condensing |
| Approx. Weight | 255 g |
| Compliance | EN 50270 |
Honeywell’s System 57 documentation identifies 05701-A-0330 as the High Integrity Relay Card-Double SPCO, with two sets of A1, A2 and A3 alarm-related single-pole changeover relay functions plus fault/inhibit functions.
The operating manual provides a more important architectural detail: the card contains eight relays, seven of which are fully configurable, while the eighth is dedicated to the fault function. The relay states are monitored by the control card, and the fault relay de-energizes if the card detects a relay malfunction. The manual also states that this high-integrity card can be used with MKII Control Cards.
Product Introduction
The Honeywell 05701-A-0330 is a high-integrity relay interface card used in the Honeywell System 57 5701 gas detection control system. It provides relay contacts for master alarm functions or combinations of master and individual alarm functions. Unlike a conventional PLC output module, the card operates as part of the System 57 gas-detection architecture, with relay-state monitoring performed by the associated control card.
The double-SPCO arrangement provides independent relay contacts for alarm and system-status functions. Relay operation can be configured for latching/non-latching and normally energized/de-energized behavior. The exact function assigned to each relay must be checked against the System 57 configuration rather than inferred solely from the terminal numbering.
05701-A-0330
Application Scenarios & Field Pitfalls
The main field concern is not the relay contact rating; it is preserving the safety logic and fail-state behavior of the original System 57 installation.
Typical applications:
- System 57 5701 gas detection panels
- Master gas alarm annunciation
- Individual A1/A2/A3 alarm outputs
- Fault and inhibit status signaling
- Ventilation or shutdown interfaces associated with gas detection
- Maintenance replacement of legacy 5701 relay cards
Engineer’s checks before replacement:
- Confirm the card identity. Several 05701-A-03xx parts exist.
05701-A-0330is the High Integrity Relay Card; it should not be confused with the Field Interface Card, control cards, sensor-drive modules, or ordinary relay cards. Honeywell’s own product guide separates these part numbers. - Verify MKII control-card compatibility. The System 57 manual specifically notes that the High Integrity Relay Card can only be used with MKII Control Cards. This is a critical compatibility check for older installations.
- Check relay configuration before removal. Honeywell instructs users to refer to the configuration printout or Engineering Interface Software to determine relay functions. Do not assume that a particular relay terminal always represents the same plant alarm.
- Treat the fault relay as part of the diagnostic chain. The fault relay is not simply another spare alarm contact. Its de-energized condition is intended to indicate a relay/card fault and should remain correctly monitored by the plant safety or alarm system.
- Check the external load. The published 5 A rating applies to non-inductive loads. Contact loading, suppression, contactor coils, solenoids, and external interposing relays should be assessed before connecting the replacement card.
- Do not substitute based on physical fit. A standard System 57 relay card may physically resemble the high-integrity version but can have a different monitoring architecture and relay arrangement.
Related Products
- 05701-A-0328 — Relay Card, Double SPCO; conventional relay configuration rather than the high-integrity 0330 version.
- 05701-A-0329 — Relay Card, Triple DPCO; provides a different relay-contact arrangement.
- 05701-A-0327 — Relay Card, Triple SPCO; different alarm relay configuration.
- 05701-A-0326 — Relay Card, Double SPCO; used for a different System 57 relay arrangement.
- 05701-A-0361 — Engineering Card for System 57; provides engineering/configuration functions rather than the high-integrity relay interface.
- 05701-A-0351 — Field Interface Card associated with the 5701 architecture.
- 05701-A-0325 — Single-channel control card for 5701 applications.
- 05701-A-0339 — System 57 master alarm update panel.
- 05701-M-5001 — System 57 5701 Control System operating documentation; useful when checking relay assignment and card compatibility.
Honeywell’s published System 57 spare-parts list distinguishes the 0330 high-integrity relay card from the other 5701 relay, control, field-interface, and engineering cards.
Procurement Note
For a replacement, specify Honeywell 05701-A-0330 — High Integrity Relay Card, Double SPCO, System 57/5701.
The most important verification points are the 5701 control-card revision, MKII compatibility, relay configuration, normally energized/de-energized state, latching behavior, field terminal wiring, and fault-relay monitoring.
One correction is especially important for procurement databases: several current reseller listings incorrectly classify 05701-A-0330 as a single-channel control card, catalytic sensor drive, or generic servo/controller module. Those descriptions conflict with Honeywell’s System 57 product guide and operating manual. The Honeywell documentation identifies it specifically as the High Integrity Relay Card-Double SPCO.
