HONEYWELL 05704-A-0121 Quad Relay Interface Card - HK SAUL AUTO

Brand Honeywell

Model 05704-A-0121

Type Quad Relay Interface Card

Series System 57 / 5704 Control System

Core Function Relay Output Interface Between Control Card and Field Devices

Country of Origin UK

Condition New / Refurbished / Surplus Available

Availability In Stock / Contact Us

Warranty 12 Months

Send E-mail Request Quote

Product Description

Product Overview

Honeywell 05704-A-0121 is a Quad Relay Interface Card designed for Honeywell System 57 and 5704 gas detection control systems. It provides the connection interface between four-channel control cards and external field wiring, allowing alarm and safety signals to be transferred to external devices.

The module includes four SPCO relay outputs that can be configured for different safety conditions including alarm levels, fault indication, and inhibit status. These relay contacts allow connection with external alarm panels, PLC systems, shutdown systems, and plant safety equipment.

The 05704-A-0121 is widely used in legacy Honeywell fire and gas detection installations where maintaining existing System 57 / 5704 infrastructure is required.

Technical Specifications

Parameter	Specification
Manufacturer	Honeywell Analytics
Model Number	05704-A-0121
Product Type	Quad Relay Interface Card
System	Honeywell System 57 / 5704
Interface Type	Relay Output Interface
Relay Quantity	4 x SPCO
Relay Operation	Selectable Latching / Non-Latching
Relay Mode	Energised / De-Energised
Contact Rating	5A at 110/250VAC (Non-Inductive)
DC Contact Rating	5A at 32VDC (Non-Inductive)
Power Consumption	1W Typical / 1.7W Maximum
Field Terminal Size	2.5mm² (14 AWG)
Height	132 mm
Width	25 mm
Depth	119 mm
Weight	Approx. 230 g
HS Code	8538900000

System Compatibility & Technical Background

Honeywell System 57 / 5704 Architecture

05704-A-0121 works as the relay output interface component inside the Honeywell 5704 gas detection controller.

Typical architecture:


	
		
			
				
					
						
							
								
								
								
									
										
											
												
Gas Detection Sensors
        ↓
Four Channel Control Card
        ↓
05704-A-0121
Quad Relay Interface Card
        ↓
External Safety Equipment
        ↓
Alarm / Shutdown / Monitoring System

Main functions:

(1) Provide relay outputs for safety signals

(2) Connect control cards with external wiring

(3) Transfer alarm conditions to external systems

(4) Support configurable alarm logic

(5) Provide voltage-free contact outputs

Typical connected equipment:

(1) PLC systems

(2) DCS systems

(3) Fire & Gas panels

(4) Emergency shutdown systems

(5) Alarm annunciators

Replacement Information

Honeywell 05704-A-0121 is mainly used for replacement and maintenance of existing System 57 / 5704 installations.

Before ordering, confirm:

(1) Exact part number:

05704-A-0121

(2) Existing controller model

(3) Four Channel Control Card compatibility

(4) Relay output requirements

(5) Terminal wiring configuration

Common replacement situations:

(1) Relay output failure

(2) Alarm signal loss

(3) Fault indication failure

(4) Fire & gas system maintenance

(5) Legacy System 57 repair

For older safety systems, replacing individual relay interface cards is usually more economical than replacing the complete gas detection controller.

Applications

Typical industries:

(1) Oil and Gas

(2) Chemical

(3) Refinery

(4) Offshore

(5) Power Plant

(6) Industrial Safety Systems

Ordering Tips

For quotation, please provide:

(1) Part number

(2) Quantity

(3) Current System 57 information

(4) Delivery country

(5) Required condition

A clear module photo helps confirm compatibility.

Verification & Quality Control

Before shipment:

(1) Verify Honeywell identification

(2) Inspect relay contacts

(3) Check PCB condition

(4) Test output functions

(5) Prepare export documents