UL Label Automatic Transfer Switch

The GE Zenith Controls, UL Label, Automatic Transfer Switch is built for residential and light commercial applications requiring the dependability and ease of operation found in a power contactor switch. These ZTX Standard Transition transfer switches are designed for standby applications, and incorporate a double-throw, mechanically interlocked contactor mechanism.

The ZTX transfer switches are equipped with the R-M3 control panel (Module 3) as standard. This microprocessor includes:

• Undervoltage sensing (90% pickup/80% dropout) of the utility source
• Voltage and frequency sensing of the generator source (90% voltage/95% frequency pickup)
• Time Delay Engine Start - 5 seconds
• Time Delay Engine Warmup - Transfer to Generator - 20 seconds (W)
• Time Delay Utility Stabilization/Retransfer to Utility - 5 minutes (T)
• Time Delay Engine Cool Down - 5 minutes (U)

Product Scope

• Ratings 40 to 400 amps (2, 3 or 4 pole)
• UL 1008, CSA and IEC listed to 240 VAC 50/60 Hz
• Double throw, mechanically interlocked contactor mechanism
• Electrically operated, mechanically held

Non-UL Label Automatic Transfer Switch

The WINCO non-UL automatic transfer switch is also a contactor type switch. While it does have fewer features than the UL label GE Zenith switch discussed above, this is a perfectly adequate switch for applications where the UL label is not required. It does not have the time delays that are available on the GE Zenith switches. Designed for standby applications.

• Engine start/stop switch included
• Exercise clock* included

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