Product Overview
The HONEYWELL ANALYTICS 05701-A-0325 DC Input Card is a dedicated power-entry module designed for the System 57 family of industrial gas and fire detection controllers manufactured by Honeywell Analytics. Serving as the primary means by which external DC power enters the System 57 sub-rack, the 05701-A-0325 accepts a nominal 24 V DC supply from a user-provided source — typically an AC-to-DC power supply unit, a plant DC bus, or a battery-backed supply — and distributes it through the Engineering Card and the rack backplane to every control card fitted in the enclosure.
Functionally, the HONEYWELL ANALYTICS 05701-A-0325 DC Input Card does far more than simply pass DC current. It incorporates a 10 A anti-surge fuse (FS1) that protects the backplane from overcurrent events, RFI filtering to preserve signal integrity in electrically noisy switchgear rooms, and reverse polarity protection that guards the entire rack against wiring errors during commissioning. Two diode-isolated input groups — designated PSU and AUX — allow a mains-derived supply and a standby battery backup to be connected simultaneously, with the card automatically drawing current from whichever source has the higher voltage, and a fused 24 V output is provided for powering ancillary devices outside the rack itself.
The 05701-A-0325 occupies a single one-inch card slot in the System 57 sub-rack alongside the Engineering Card, and its two-part terminal blocks TB1 and TB2 allow the card to be removed for service without disturbing any field wiring. Beyond its power-distribution role, the card also carries an interface to optional Engineering Card plug-in modules — including Modbus RS485/RS422, RS232 Event Printing, and Alarm Update modules — making the HONEYWELL ANALYTICS 05701-A-0325 DC Input Card an essential, mission-critical building block in every System 57 gas and fire detection installation worldwide.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 05701-A-0325 |
| Manufacturer | Honeywell Analytics |
| Product Type | DC Input Card (Power Entry Module) |
| Compatible Platform | System 57 (5701 / 5704 / 5704F Control Systems) |
| Supply Voltage Range | 18 V to 32 V DC (nominal 24 V DC) |
| Fuse Rating | 10 A anti-surge, 1¼ × ¼ inch (FS1) |
| Maximum Backplane Current | 8 A continuous |
| Input Groups | PSU 1 / PSU 2 and AUX 1 / AUX 2, diode-isolated |
| Fused DC Output | +24 V Out (Fused) / 0 V Out (Fused) for ancillary devices |
| Field Terminal Capacity | 2.5 mm² (14 AWG) |
| Dimensions (H × W × D) | 112 mm × 25 mm × 102 mm |
| Weight | 129 g |
| Operating Temperature | −5 °C to +55 °C |
| Storage Temperature | −25 °C to +55 °C |
| Humidity | 0 to 90% RH, non-condensing |
| EMC / RFI Conformity | EN50081-1/-2 (emission), EN50082-1/-2 (immunity), 10 V/m radiated susceptibility 50 kHz–1 GHz |
| Design Standard Reference | EN54-2 (Fire Detection and Alarm System) |
