1. Product Overview
The Mars 92291 SPST 110/120 Relay is a robust power relay designed for various electrical applications. It features an 18-amp contact rating, a pick-up voltage of 102V, and a 60Hz frequency. Its flange bracket type and quick-connect terminals make it suitable for straightforward installation in compatible systems.
Image: The Mars 92291 SPST 110/120 Relay, a black rectangular component with multiple quick-connect terminals on its sides and a mounting flange on one end. This image provides a clear view of the relay's physical design and connection points.
Key Features:
- Bracket Type: Flange mount for secure installation.
- Contact Rating: 18 Amps, suitable for moderate power loads.
- Pick-Up Voltage: 102 Volts, ensuring reliable activation.
- Terminal Style: Quick Connect for easy wiring.
- Operation Mode: Automatic.
- Material: Copper alloy contacts for durability.
2. Specifications
| Specification | Value |
|---|---|
| Model Number | 92291 |
| Brand | MARS - Motors & Armatures |
| Connector Type | Quick Connect |
| Contact Material | Copper Alloy |
| Contact Type | SPST |
| Current Rating | 18 Amps |
| Mounting Type | Flange Mount |
| Operation Mode | Automatic |
| Coil Voltage | 102 Volts |
| Maximum Switching Current | 18 Amps |
| Minimum Switching Voltage | 102 Volts |
| Item Weight | 2.53 ounces |
| Product Dimensions | 2.7 x 2.4 x 2.7 inches |
| Included Components | 1 switching relay |
3. Setup and Installation
3.1 Safety Precautions
Always prioritize safety when working with electrical components. Failure to follow these precautions can result in electric shock, injury, or damage to equipment.
- Disconnect Power: Ensure all power to the circuit is disconnected before beginning installation or maintenance.
- Qualified Personnel: Installation should only be performed by qualified electricians or technicians.
- Proper Tools: Use insulated tools appropriate for electrical work.
- Verify Voltage: Confirm that the supply voltage matches the relay's coil voltage (102V) and contact rating (110/120V system compatibility).
- Wiring Diagrams: Always refer to the specific wiring diagram of your application.
3.2 Installation Steps
- Mounting: Secure the relay using its flange mount. Ensure it is firmly attached to a stable surface, away from excessive heat or moisture.
- Identify Terminals: Locate the quick-connect terminals on the relay. These are typically labeled or follow standard relay pinouts.
- Connect Coil Wires: Connect the control circuit wires to the relay's coil terminals. Ensure correct polarity if specified by your application's diagram. The coil voltage is 102V.
- Connect Load Wires: Connect the power circuit wires to the relay's contact terminals (SPST configuration). Ensure the load current does not exceed 18 Amps.
- Verify Connections: Double-check all wiring connections for tightness and correctness according to your system's schematic.
- Restore Power: Once all connections are secure and verified, carefully restore power to the circuit.
4. Operation
The Mars 92291 is an automatic SPST (Single Pole, Single Throw) power relay. Its operation is straightforward:
- When the control voltage (102V) is applied to the coil, the relay "picks up," closing its internal contacts. This allows current to flow through the connected load circuit.
- When the control voltage is removed or drops below the "drop-out voltage" (24V), the relay "drops out," opening its contacts and interrupting the load circuit.
- The relay is designed for continuous automatic operation within its specified voltage and current limits.
5. Maintenance
The Mars 92291 Relay is designed for long-term, reliable operation with minimal maintenance. However, periodic inspection can help ensure optimal performance and longevity.
- Visual Inspection: Periodically inspect the relay for any signs of physical damage, discoloration, or loose connections.
- Terminal Integrity: Ensure all quick-connect terminals remain clean and securely attached to their respective wires. Loose connections can lead to overheating and poor performance.
- Environmental Conditions: Verify that the relay is operating within its intended environmental conditions (e.g., temperature, humidity) and is free from excessive dust or moisture accumulation.
- Cleaning: If necessary, gently clean the exterior of the relay with a dry, soft cloth. Do not use liquid cleaners or solvents.
6. Troubleshooting
This section provides guidance for common issues you might encounter with your relay. Always disconnect power before attempting any troubleshooting or repairs.
| Problem | Possible Cause | Solution |
|---|---|---|
| Relay does not activate (no click sound) | No power to coil; Incorrect coil voltage; Damaged coil; Loose connections. | Check control circuit power supply. Verify coil voltage is 102V. Inspect coil for damage. Secure all coil connections. |
| Relay activates but load does not receive power | Open contacts; Overload; Incorrect wiring of load circuit; Damaged contacts. | Check load circuit wiring. Ensure load current is within 18 Amps. Inspect contacts for burning or pitting. |
| Relay hums or buzzes excessively | Low coil voltage; AC hum (normal for some relays); Mechanical issue. | Verify coil voltage is stable at 102V. A slight hum is normal for AC relays. If excessive, check mounting for vibration or consider replacement. |
| Relay overheats | Overcurrent on contacts; High ambient temperature; Poor ventilation; Loose connections. | Reduce load current to stay within 18 Amps. Ensure adequate ventilation around the relay. Tighten all connections. |
If troubleshooting steps do not resolve the issue, it may indicate an internal fault with the relay, and replacement may be necessary.
7. Warranty Information
Specific warranty terms for the Mars 92291 SPST 110/120 Relay are provided by the manufacturer, MARS - Motors & Armatures, Inc., or the authorized seller at the time of purchase. Please refer to your purchase documentation or contact the seller/manufacturer directly for detailed warranty coverage, duration, and claim procedures.
8. Customer Support
For technical assistance, product inquiries, or support regarding the Mars 92291 SPST 110/120 Relay, please contact the manufacturer or your point of purchase. When contacting support, please have your product model number (92291) and any relevant purchase details ready.
Manufacturer: MARS - Motors & Armatures, Inc.
For general information about Mars products, you may visit their official website (if available) or search for "MARS - Motors & Armatures" online.
