How latch-trip (interlock) relays work

A latch-trip relay has two coils sharing one switch set: the latch coil pulls the armature in and a mechanical lock holds it, and the trip coil releases it. It keeps its state with no power, even with the game switched off.

Systems

• Electro-mechanical

Related tips

• Gottlieb 1970s Ax/Bx latch-trip relays misbehave
• Game resets but will not start: adjust hold relay and reset-completed relay latch
• Gottlieb relay return springs
• Relay banks and their reset coil
• 1975+ Gottlieb won't reset: Ax/Bx latch relay blades out of their slots
• Start button gives a two-player game: wire on a latch relay touching another
• Gottlieb AS relay (miniature match stepper)
• Push relays in by hand gently and straight

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)