Our newest Intrinsically Safe Stop and Start Relays are an economical means of controlling mining equipment in areas with potentially explosive environments. Approved by MSHA, these relays provide a compact, solid-state, start/stop design that is inherently incapable of releasing sufficient electrical energy to ignite explosive gases. The Stop Relay is C4325-001 (Base is C4325-002) and the Start Relay is C4325-005 (Base C4325-006). Other models are available.