Mercury Relay

A mercury relay is a mercury-added product or device that opens or closes electrical contacts to effect the operation of other devices in the same or another electrical circuit. Examples of mercury relays:

• Mercury displacement relays
• Mercury wetted reed relays
• Mercury contact relays

Mercury Switch

A mercury switch is a mercury-added product or device that opens and closes an electrical circuit or gas valve. Examples of mercury switches:

• Mercury float switches
• Mercury tilt switches
• Mercury pressure switches

Note A mercury switch DOES NOT include a mercury containing thermostat or a diostat.

Mercury Diostat

A mercury diostat is a mercury switch that controls a gas valve in an oven or oven portion of a gas range.

Definition Resources

Health and Safety Code section 25214.8.1

• subdivision (b)(3) - Mercury Relays
• subdivision (b)(4) - Mercury Switches
• subdivision (b)(4)(C) - Mercury Diostats
• subdivision (b)(1) - Mercury-Added Products