Description
Product Parameters
- Model Number: 05704-A-0121
- Series: System 57 (Specifically for 5704 Four-Channel Control Cards)
- Type: Quad Relay Interface Card
- Relay Channels: 4 x SPCO (Single Pole Change Over / Form C)
- Relay Contact Rating: * 5 A at 110V/250V AC (Non-inductive)
- 5 A at 32V DC (Non-inductive)
- Power Consumption: 1.7 W (Max) / 1.0 W (Typical)
- Field Terminals: Supports wire up to 2.5 mm2 (14 AWG)
- Operating Temperature: -5°C to +55°C
Product Description The Honeywell 05704-A-0121 is a Quad Relay Interface Card designed as a companion for the System 57 (5704 series) Four-Channel Control Cards. Its primary role is to provide a physical interface for field wiring and to offer four independent relay outputs that correspond to the alarm logic of the control card. Each relay is software-configurable for various operational modes, including latching/non-latching and normally energized/de-energized (failsafe) states. This module is essential for triggering external sirens, beacons, or shutdown systems based on gas or fire detection signals processed by the System 57 rack.
Application Areas This interface card is a standard component in Honeywell Analytics gas and fire detection systems used in:
- Industrial Gas Monitoring: Interfacing with catalytic or 4-20mA sensors in refineries and chemical plants.
- Fire Detection Systems: Connecting industrial fire detectors and manual call points to a central 19-inch rack.
- Safety Linkage: Activating emergency ventilation, shut-off valves, or fire suppression systems via its high-current relay contacts.
Product Specifications
- Weight: 230 g
- Dimensions: 132 mm (H) x 25 mm (W) x 119 mm (D)
- Country of Origin: UK / USA
- Compliance: EN50270 (EMC Compliant)
Operational Precautions
- Obsolescence Note: The System 57 line has been largely phased out by Honeywell in favor of the Touchpoint Pro and Touchpoint Plus series. Finding new-old-stock (NOS) or refurbished units is common, but ensure the hardware revision matches your existing rack components.
- Relay Inductive Loads: While the contacts are rated for 5A, using them for highly inductive loads (like large solenoid valves or motors) without external suppression (diodes or RC snubbers) can significantly reduce contact life and cause electrical noise in the rack.
- Configuration Sync: Ensure the DIP switches or software settings on the 05704-A-0121 match the intended logic of the 5704 control card it is paired with. An incorrect “energized/de-energized” setting can lead to a false system trip or a failure to alarm.
- Hot-Swapping: Avoid removing the interface card while the rack is powered if field wiring is live. The system is modular, but removing an interface card while active can trigger a “Fault” condition across the entire rack segment.
Recommended Similar Product Models
| Model Number | Product Category | Feature Set |
|---|---|---|
| 05704-A-0144 | Control Card | 4-Channel Catalytic Control Card |
| 05704-A-0145 | Control Card | 4-Channel 4-20mA Control Card |
| 05704-A-0131 | Relay Interface | 16-Relay Expansion Assembly |
| 05701-A-0301 | Engineering Card | System 57 Programming/Audit Module |
| 05701-A-0406 | DC Input Card | Rack Power Input Module |
