Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the Diversitech Packard C340B 3 Pole 40 Amp Contactor with a 120 Volt Coil. Please read this manual thoroughly before proceeding with any installation or operation to ensure proper function and safety.
Safety Information
WARNING: Electrical shock hazard. Installation and servicing should only be performed by qualified personnel. Failure to follow these instructions can result in serious injury or death.
- Always disconnect power before installing or servicing the contactor.
- Ensure all wiring complies with local and national electrical codes.
- Verify that the voltage and current ratings of the contactor match the application requirements.
- Do not operate the contactor if it appears damaged.
Product Overview
The Packard C340B is a 3-pole, 40 Amp contactor designed for switching electrical loads in various applications, including HVAC systems, motor control, and lighting. It features a 120 Volt coil for activation.
Image showing the Packard C340B 3 Pole 40 Amp Contactor. The contactor features a black housing, three main power terminals with brass-colored contacts, and a top label indicating specifications and wiring.
Setup and Installation
Installation of the C340B contactor requires electrical knowledge and should be performed by a qualified electrician.
- Power Disconnection: Ensure all power to the circuit where the contactor will be installed is completely disconnected at the main breaker or fuse box. Verify with a voltage tester.
- Mounting: Securely mount the contactor to a stable surface using appropriate fasteners. Ensure adequate clearance for wiring and ventilation.
- Wiring Main Power: Connect the incoming line voltage to the designated line terminals (L1, L2, L3) and the load to the corresponding load terminals (T1, T2, T3). Ensure connections are tight and secure.
- Wiring Coil: Connect the 120 Volt control circuit to the coil terminals. Observe proper polarity if specified.
- Verification: Double-check all wiring connections for tightness and correctness according to the wiring diagram of your specific application.
- Power Restoration: Once all connections are verified and secure, restore power to the circuit.
Operating Instructions
The Packard C340B contactor operates by receiving a 120 Volt signal to its coil. When the coil is energized, it creates a magnetic field that pulls the contacts together, closing the main power circuit and allowing current to flow to the connected load. When the coil is de-energized, the contacts open, interrupting the power to the load.
- Ensure the control circuit is properly connected to the coil terminals.
- Apply 120 Volts to the coil to engage the contactor.
- Remove 120 Volts from the coil to disengage the contactor.
Maintenance
Regular inspection and maintenance can extend the life of your contactor. Always disconnect power before performing any maintenance.
- Visual Inspection: Periodically inspect the contactor for signs of wear, corrosion, or damage to the housing, terminals, and contacts.
- Terminal Tightness: Check all terminal connections for tightness. Loose connections can cause overheating and arcing.
- Cleaning: Keep the contactor free from dust, dirt, and debris. Use a dry, non-conductive brush or compressed air for cleaning.
- Contact Wear: While typically not user-serviceable, excessive arcing or pitting on contacts may indicate the need for replacement.
Troubleshooting
If the contactor is not functioning as expected, consider the following common issues:
- Contactor Does Not Engage:
- Check if 120 Volts is present at the coil terminals when the control circuit is active.
- Verify the coil is not open or shorted (measure resistance if possible, with power off).
- Ensure all wiring connections to the coil are secure.
- Contactor Engages but Load Does Not Receive Power:
- Check for continuity across the main power terminals when the contactor is engaged (power off).
- Inspect main power wiring for loose connections or breaks.
- Verify the load itself is functional.
- Buzzing Noise:
- A slight hum is normal, but excessive buzzing may indicate loose laminations, dirt on the magnet faces, or incorrect coil voltage.
- Ensure mounting screws are tight.
Specifications
| Feature | Specification |
|---|---|
| Model Number | C340B |
| Poles | 3 |
| Ampere Rating | 40 Amp |
| Coil Voltage | 120 Volt |
| Product Dimensions | 3.4 x 2.25 x 2.75 inches |
| Item Weight | 10.4 ounces |
| Manufacturer | Packard |
| Country of Origin | China |
Warranty and Support
For warranty information or technical support regarding your Diversitech Packard C340B Contactor, please refer to the documentation provided at the point of purchase or contact Diversitech customer service directly. Keep your purchase receipt for warranty claims.
