12HFA51A42H GE HFA Multicontact Auxiliary Relay
Manufacturer: GE Fanuc
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Part Number: 12HFA51A42H
Condition：New with Original Package
Product Type: Auxiliary Relays
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
GE 12HFA51A42H HFA Series Multicontact Auxiliary Relay
The GE 12HFA51A42H, also cataloged as the 12HFA51A42H Multicontact Auxiliary Relay, operates as a dedicated hardware component for multi-circuit switching and interlocking logic execution within power substation control and protection panels.
Suffix Breakdown & Model Matrix
| Part Segment | Code / Suffix | Technical Definition |
|---|---|---|
| Basic Type | 12 | Product Generation / Frame Designation |
| Model Family | HFA | High-Speed Multicontact Auxiliary Relay Series |
| Construction | 51 | Hand-Reset / Self-Reset Operating Mechanism Variant |
| Contact / Coil | A42H | 125 VDC Coil Specification and 12-Contact Configuration |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 12HFA51A42H |
| Brand | GE (General Electric) |
| Origin | USA |
| Weight | 1.0 kg (2.2 lbs) |
| Dimensions | 12 in x 12 in x 12 in |
| Operating Temp | -30 deg C to +65 deg C |
| Power Consumption | +5 VDC at 6 A (Auxiliary logic power requirement) |
| Coil Voltage | 125 VDC |
| Contact Capacity | Up to 12 independent contact circuits |
| Reset Mechanism | Self-resetting configuration |
| Application Target | Protection, signaling, and interlocking control logic |
Backplane Bus Communication & I/O Density Scaling
The auxiliary relay interfaces directly within hardwired relay panels and high-density control racks, enabling rapid signal multiplication across 12 independent contact paths. Contact actuation occurs instantaneously upon coil energization, delivering low latency and deterministic switching behavior across interlocking loops. Built-in contact geometry supports I/O density scaling inside protection cabinets while maintaining firmware flash compatibility with upstream digital protective relays for continuous status monitoring and system fault execution.
Frequently Asked Questions
Q: What operational behavior does the self-resetting mechanism provide during control loop actuation?
A: The self-resetting mechanism automatically returns all 12 contact circuits to their normal position once the 125 VDC coil voltage de-energizes, eliminating the need for manual physical reset flags or external electrical reset signals.
Q: How do the 12 independent contact circuits handle complex interlocking logic?
A: Each contact set operates electrically isolated from the others, allowing field engineers to mix control, alarm signaling, and trip isolation circuits across different DC voltage potential buses within the same physical relay module.
Field Installation Guidelines
Mount the relay vertically on standard panel cutout frameworks using approved mounting hardware to ensure structural stability under mechanical vibration. Run all high-voltage DC control wires through dedicated wiring troughs, maintaining strict physical separation between 125 VDC coil leads and low-voltage logic cables. Field technicians must verify coil supply polarity before applying power, ensure all terminal screws are torqued down securely to mitigate contact resistance, and confirm that panel grounding connections adhere to substation low-impedance grounding standards.