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Electrical Wire and Cable

How Electrical On-Delay Staging Relays Work

staging-relay ©Copyright
Summary: This section will cover the use of relays that are sometimes needed to control special device loads such as Air Conditioners and other high demand equipment from starting at the same time.

Problem Solvers for Air Conditioners - Energy Savers for Large Electrical Loads

  This method will help prevent nuisance tripping of sub-feed circuit breakers and reduce the electrical demand on your utility service which could lead to much higher energy bills.

• 3 or 5 minute fixed
• Works with anticipator thermostats

When power is applied to the input, the
time delays begins. After the time delay is
complete, the load energizes and remains
energized as long as power is applied.
The control is reset by removing power
during or after the time delay period.


1. Disconnect power.

2. Connect terminals in series with the
starting device as shown in the wiring
diagram below.

3. Reapply power, check operation.

4. Trickle current bypass resistor
T1 to T3 <1K ohm.

2-Wire Compressor Staging/Startup Delay Timer:



• Voltage: 18-30 VAC
• Frequency: 50/60 Hz
• Output Ratings:
– Maximum: 1.5 amps
– Minimum: 40 mA
– Inrush: 15 amps
Time Delay
• 3 or 5 minute fixed


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