Can this 40A contactor replace a 30A contactor?

Yes. This 40A contactor is a safe upgrade for a 30A unit, provided the Coil Voltage (120V) and Poles match. Rule: Coil voltage must be exact; Amps can be higher, but never lower than your original one.

My equipment runs on 240V, but I have a 120V control source. Will this work?

Yes. The "120V" refers to the Coil (control) voltage only. The power poles (contacts) are rated up to 600V, so they can easily and safely switch a 240V load while being triggered by a 120V source.

Can I use this to control a bank of grow lights with a timer?

Yes, absolutely. This is ideal for switching high-power lighting loads (like HPS, MH, or LED grow lights). You can connect the 120V coil terminals to a standard wall timer or smart plug to automate your lighting setup safely.

Is this suitable for a sump pump or pool pump motor?

Yes. It is rated for 40 Amps, making it heavy-duty enough to handle the high startup current (inrush) of pump motors. Just ensure your control switch (float switch or timer) provides a 120V signal.

My old contactor buzzes/hums — will replacing it fix that?

Often yes. Buzzing can be caused by a worn coil/armature, pitted contacts, or low control voltage. Replacing the contactor commonly resolves noise if the control voltage is stable and wiring is correct

Connector Type	Quick Connect, Screw
Contact Material	Silver Cadmium Oxide
Contact Type	Normally Open
Current Rating	40 Amps
Mounting Type	Panel Mount
Brand	SUNLEE
Operation Mode	Automatic
Coil Resistance	360 Ohms
Coil Voltage	120 Volts
Contact Current Rating	40 Amps
Minimum Switching Voltage	120 Volts (AC)
Specification Met	UL
Upper Temperature Rating	70 Degrees Celsius
Manufacturer	sunlee controls
Item Weight	9.9 ounces
Product Dimensions	3.43 x 2.09 x 3.15 inches
Size	2P 40A 120VAC
Material	Copper
Batteries Included?	No
Batteries Required?	No

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