All include a combination of a solid state timing circuit and an electromechanical relay output. This combination provides the user with isolation between the operating and load voltages and multiple switching contacts in either SPDT or DPDT forms. Most of the relay contacts are rated 10A @ 240VAC; some are 15A resistive @ 240 VAC.

Timer, Time Delay Relay - Function Selection Guide

If you need help selecting a timing function, use the Interactive Timer Function Selection Table
Animated time diagrams included in this section show how each of the five most common timing functions operate in a test circuit.

Time Delay Relays -- a solid state timing circuit and an electromechanical relay output.
Timing Module -- totally solid state timing modules with no moving parts

Time Delay Relays
Time Delay Relays all include a combination of a solid state timing circuit and an electromechanical relay output. This combination provides the user with isolation between the operating and load voltages and multiple switching contacts in either SPDT or DPDT forms. Most of the relay contacts are rated 10 amps resistive @ 240 VAC. Many are in the popular octal plug-in package and require the purchase of a socket. Others surface mount with one or two screws and have male 0.25" quick connect terminals. Some are encapsulated to protect the solid state circuitry. A large selection of time delay ranges and adjustment methods are available.

Timing Modules
All popular functions are available in this group of totally solid state timing modules. They contain no moving parts so 100 million operations is typical. They are encapsulated to protect their analog or digital solid state circuitry. A large selection of time delay ranges are available, knob or switch adjustment, or external adjustment, or factory fixed time delays can be ordered.