Okay, let's break this down. You're asking about using a contactor with a coil rated for 120-277V to switch 208V lighting loads, and whether you can control the coil with 120V.

The Short Answer: YES, it should work, provided you understand the voltage rating of the contactor coil and are using the appropriate terminals.The Explanation and Key Considerations

1.

Contactor Coil Voltage is Key

The most important thing is the

coil voltage of the contactor. You stated that it is rated for 120-277V. This means the coil is designed to operate reliably within that voltage range. Since 120V is within this range, you should be able to use 120V to energize the coil and close the contacts.2. Contactor Contact Voltage and Amperage

Make sure the contacts of the contactor are rated for at least 208V and have an amperage rating that meets or exceeds the total amperage draw of your outdoor lighting load (the light poles and bollards). If the contacts are only rated for 120V, or don't have sufficient ampacity, you can't use this contactor for your application. This is separate from the coil voltage rating. The contact voltage and ampacity rating will be clearly marked on the contactor.3.

Wiring

This is critical:

Power to the Lighting

Your 208V supply from the breaker will land on the "line" side terminals of the contactor. The wires going to your light poles and bollards will be connected to the "load" side terminals of the contactor. This is the high-voltage switching part.

Coil Wiring (Control)

Connect your 120V power source (from the time clock) to the appropriate coil terminals on the contactor. These terminals will be clearly marked (usually "A1" and "A2" or similar).

Double-check the contactor's wiring diagram to be sure you are connecting to the coil terminals. Improper wiring can damage the contactor or create a safety hazard. Neutral for the 120V Control Circuit

You will need a neutral wire connected to the 120V control circuit for the time clock to operate correctly.

Grounding

Ensure proper grounding of the enclosure and any other grounding points as per electrical code.4.

Time Clock Compatibility

Verify that the time clock you are using has a 120V output to trigger the contactor. It needs to be able to handle the inrush current of the contactor coil, although that inrush current is typically small.5.

Code Compliance

All wiring and installation must comply with local and national electrical codes (e.g., NEC in the US). Consider having a licensed electrician review the installation to ensure code compliance and safety.6.

Contactor Datasheet

The most important thing you should do is check the datasheet for your specific contactor. The datasheet will provide a wiring diagram and confirm the acceptable voltage range for the coil.

Example (Hypothetical)

Let's say you have a contactor with these specs:

Coil Voltage

120-277VAC

Contact Voltage

600VAC

Contact Amperage

30AIn this case, you could safely use 120VAC from your time clock to energize the coil, switching 208VAC to your lighting load, provided the lighting load is less than 30 Amps.
Potential Issues and Troubleshooting



Coil Doesn't Energize

If the contactor doesn't close when the time clock is on, check the following: Is the time clock outputting 120V? Are the wires connected correctly to the coil terminals on the contactor? Is there a wiring fault in the 120V control circuit? Is the contactor coil defective?

Contactor Buzzing

A buzzing sound from the contactor might indicate a problem with the coil, low voltage, or a loose connection.

Overheating

If the contactor is overheating, it's a sign of overload or a malfunctioning contactor. Immediately disconnect the power and investigate.

Recommendation:

Given the potential for electrical hazards, it's highly recommended that you consult with a qualified and licensed electrician to review your plan, select the appropriate components, and perform the installation. They can ensure that the system is safe, code-compliant, and operates reliably. While the theory is straightforward, improper wiring can have serious consequences. Flag for review