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Other Range of Transfer Switches ZTS ZTSD ZTG ZTX
ZTGD Series switches are built for delayed transition applications that require the dependability and ease of operation found in a power contactor switch.
The delayed transition switch offers an adjustable time delay during transfer from one position to another. This is primarily for transfer of large motor or inductive loads, and allows these loads to re-energize after transfer with only normal inrush starting currents.
The ZTGD Series incorporates all the important features of the standard ZTG Series in a unique design. The operation of the delayed transfer switch is totally independent of the synchronism of the power sources, eliminating the need for in-phase monitors or extensive motor disconnect control wiring between the transfer switch and motor control centers.
Electrical Ratings
- Ratings 40 to 3000 amperes
- 2, 3 or 4 poles
- Double-throw, mechanically interlocked contactor mechanism
- Available in ZTG (standard) or ZTGD (delayed) transition models
- Suitable for emergency and standby applications
- UL 1008 listed at 480 VAC
- CSA certified at 600 VAC
- IEC 947-6-1 listed at 480 VAC
- Open type, NEMA 1, 3R, 4, 4X and 12
Performance Features
- Close differential under-voltage sensing of the normal source
- Voltage and frequency sensing of the emergency source
- Test switch (fast test/load/no load) to simulate normal source failure?2014automatically bypassed should the emergency source fail
Design and Construction Features
- Mechanically interlocked center-off position for load decay
- Electrically operated, mechanically held by a simple, over-center mechanism
- Segmented silver tungsten alloy contacts with separate arcing contacts on 600 amps and above
- Arc quenching grids, enclosed arc chambers and wide contact air gap for superior source-to-source isolation on all units
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