What Is 86 On A Relay? Explained Spst Rely Vs Spdt Rely Symbols Wiring Digrms Explined

Author Dalbo 03 Jun 2026

In this article we will discuss, the working, function, and significance of the master trip relay, also known as the 86 relay 86h output is wired with turbine. We will explore the different types of master trip relays, their classifications,.

86 Lockout Relay Wiring Diagram - Wiring Diagram

What Is 86 On A Relay? Explained Spst Rely Vs Spdt Rely Symbols Wiring Digrms Explined

Auxiliary and lockout relays (ieee function code 86) provide additional branch control signals from a single point of origin (like a circuit breaker) These relays only operate when the fault is heavy or might have chance to damage the electrical or mechanical equipment The master trip (86) relay is a auxiliary control component in electrical power system protection schemes that serves as the primary switching mechanism between protective relays and.

It is a type of auxiliary relay that functions as a bridge between the protection relays and the circuit breaker trip coil

The ansi code of the master trip relay is 86 Master trip relay receives the. When current passes through this pin, it completes the circuit, allowing electrical flow through the coil, which activates the relay Pin 86 connects to the positive side of the power.

Master trip relay is a contact multiplication or an auxiliary relay, which operates on the command from multiple protection relays and gives a single command to the breaker trip coil. The output contacts of lock out relay are wired to the breaker trip coil circuit Therefore, whenever the relay gets energized, trip command to the breaker is issued This relay is also known as master trip.

What is a Master Trip (ANSI Code 86) Relay?

The 86 relay is a latching auxiliary relay that trips & disables a circuit breaker (or numerous breakers) during a serious malfunction

Once operated, it remains locked in the tripped. Master trip relay is an electrical protection device which received multiple commands from multiple safety relay and provides a a single commands to the trip coil of vaccume/ sf6 circuit breaker. These relays are called as lock out relays