Contactor/motor overload relay noises

A Siemens SXL-EO 90 A 600 VAC contactor opening and closing. These are intended for use with reasonably powerful motors, and are designed to work in concert with an overload relay that detects if the internal temperature of the motor has reached dangerous levels. The overload relay has manual trip and close buttons, which is what I'm using to control the contactor when recording this sound effect.

First 9 clicks are manually opening and closing the overload relay on the contactor. Next 9 clicks are from opening/closing another switch. The very loud thunk noises that follow are actually switching the contactor on and off.

Recorded using the microphone of an iPhone 11 with no further processing.