Why Are Some Breakers Tied Together With a Handle Tie?

Why Are Some Breakers Tied Together With a Handle Tie?

A handle tie is a physical clip or bar that connects two adjacent single-pole breakers so they trip together when either one trips. Handle ties create a two-pole switching and protection function from two single-pole breakers, ensuring that both hot conductors of a 240V or multi-wire circuit are disconnected simultaneously when a fault occurs on either leg.

When Handle Ties Are Required

• Multi-wire branch circuits (MWBC): a circuit that shares a neutral between two hot conductors from opposite phases — the handle tie ensures both hots are de-energized when the circuit is shut off for service, protecting anyone working on the neutral
• 240V circuits that use two single-pole breakers instead of a true double-pole breaker — the tie ensures simultaneous disconnection of both legs
• Any circuit where the Ontario Electrical Code requires a common-trip or common-handle arrangement to ensure complete isolation of the circuit

Handle Tie vs. Double-Pole Breaker

A true double-pole breaker is a single unit with an internal trip mechanism that guarantees simultaneous trip of both poles under fault conditions — this is the preferred method for 240V circuits. A handle tie on two single-pole breakers provides common-handle operation (both turn on/off together manually) and common trip only if the breakers are listed as a pair for that purpose. For most 240V circuits and all MWBCs in Ontario, verify that the breakers are either a listed double-pole unit or a manufacturer-approved single-pole pair with an approved handle tie. EZSMART wires all circuits to Ontario Electrical Code requirements. Contact us for panel work or circuit additions.

Amir Azimipour

Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp