Description says 300a continuous but in the lower info it states note: normally make 80a as working current, need break 5 sec on, 50 min off - why???

This is MaySpare Service. The Max Short Time Current can endure 300A; But if u want to keep working for more than one hour without break, the current need be about 80Amp; Otherwise the body of solenoid will be so hot and burned

How many miliamps does it require to activate the solenoid? I want to make sure my momentary push button switch can support activation of this solen

I believe the coil resistance is around 14 ohms which would make the current around 900 milliamps. But Rember thr collaspe of the coil during disconnect creates large spikes across a small switch and burn the switch contacts, therefore I would a 1 amp @600 volt despising diode across the solenoid coil to protect your switch contacts.

None of the posts are labeled. Which one is the on switch?

This is generally used to power large loads like a starter or like my app. Four bilge blowers. The big posts on the side are battery cable in than wires out to the load. The small posts are power and ground to run the solenoid. Connect one to ground one to the switch. You might want to test the small posts with an ohm meter. Make sure neither is to ground .

why is his thing getting so hot?

Give me some background info, how many amps drawn ,voltage and application

Max 300a Continuous Duty Solenoid Relay Nickel Plating For Winch

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

⚙️ Power Up Your Performance!

SMART OPERATION - Designed for optimal performance with a 5 sec on, 50 min off cycle to prevent overheating.
UNMATCHED POWER - Experience a robust 150A continuous duty performance, perfect for demanding applications.
EFFICIENT ENERGY USE - Low 10.2W consumption means you can power up without draining your resources.
RUST RESISTANT DESIGN - Crafted with nickel-plating to ensure longevity and shine, even in harsh environments.
VERSATILE COMPATIBILITY - Fits a wide range of models, making it the go-to choice for winches and marine applications.

The Max 300A Continuous Duty Solenoid Relay is engineered for high-performance applications, featuring a robust 150A capacity and a durable nickel-plated exterior. With a low energy consumption of 10.2W and compatibility across various models, this relay is perfect for winches and marine use, ensuring reliability and efficiency in every operation.

Specifications

ASIN	B072MZHK48
Brand	MaySpare
Coil Resistance	14 Ohms
Coil Voltage	12 Volts
Connector Type	Screw
Connector type	Screw
Contact Current Rating	300 Amps
Contact Material	Copper
Contact Type	Normally Open
Contact material	Copper
Contact type	Normally Open
Current Rating	300 Amps
Current rating	300 Amps
Customer Reviews	4.3 out of 5 stars 1,498 Reviews
Manufacturer	MaySpare
Manufacturer Part Number	CA-JD4T300A
Minimum Switching Voltage	12 Volts (DC)
Mounting Type	Boat Mount
Mounting type	Boat Mount
Number of Items	1
Operation Mode	Automatic
Specification Met	Mayspare Quality Standard
Wattage	10.2 watts

Reviews

A**S

Holds up the the amps needed for hydrolic tilt bed trailer

Replaced old solenoid with a cheaper on, not considering the amperage needed, and learned quickly what I really needed. This is the right tool for the job, holding up to the demand. Priced right and works great.

4.08.2026

J**.

Would recommend

Bought to replace an expensive excavator solenoid and has worked flawlessly for over a year.

30.07.2026

T**K

Looks good thanks

Looks good have not used it yet thanks come with nuts and everything

28.08.2026

H**A

Starter solenoid

Continue starting solenoid comes with 1 resistor and a diode. Lil confused about this resistor and diode. How they goes to install with the solenoid. No details or diagram or schematic. Well I paralleled the resistor with solenoid and I series the diode to latch input negative to the battery

18.10.2023

G**E

Very heavy duty for my lawn mower it went through 2 stock ones and I bit the bullet!

Works great for any type of lawn mower

10.08.2026

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