Review on 💡 ONLINE LED STORE - 1 Pack of 5-Pin 12V Bosch Style Waterproof Relay Kit with Harness Socket, 12 AWG Hot Wires, SPDT, 30/40 Amp - Ideal for Automotive, Marine, Boats, Auto Fan, and Cars by Michael Hale

The description says the relay is rated for 30 amps. Based on over 30 years experience with relays I would say they are rated for around 5 amps. Compared with the Omron G8JN relay side by side, the difference is comparable to day and night. These relays are encapsulated in a plastic case with epoxy resin. Epoxy resin is brittle and will crack at extreme temperatures, leading to leaks. The G8JN relay has a plastic housing that is molded around the terminals to ensure lasting water tightness. These relays have small and misaligned contacts resulting in high resistance compared to the G8JN relay which has large well aligned contacts. The sockets supplied with these relays are probably rated for 30 amp loads, but the relays themselves are not rated for 30 amp loads. When used with a 20A pump motor, the relays would heat up due to the high contact resistance, burn paint on the coil wire, which would quickly lead to unreliable operation with subsequent complete failure. If you really need a 30 amp relay then the G8JN is a much better choice.