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Other Range of Transfer Switches ZTS ZTG ZTGD ZTX
When large motors, uninterruptible power supplies (UPS) systems and/or transformers make up the bulk of the load, delayed transition transfer switches offer ideal protection.
The ZTSD Series provides an adjustable time delay in the centered "off" position. This delay allows motors to coast down and transformers to decay, meaning inductive loads may be re-energized after transfer with only normal inrush starting currents.
These switches, which are strongly recommended by major UPS manufacturers, are ideal for pumping stations, sewage treatment plants, hospital X-ray equipment or wherever the load makes a delay desirable. The ZTSD Series allows a UPS system sufficient time to recognize a power failure and transfer to batteries, acknowledge the return of power and thereby reduce any transfer anomalies.
The ZTSD Series incorporates all the important features of the standard ZTS Series in a unique design that includes specific operational properties. The performance, operating capabilities, ratings, UL listings, withstand current values and available options are identical to those of the ZTS Series.
Electrical Ratings
- Ratings 40 to 4000 amperes
- 2, 3 or 4 poles
- Open type, NEMA 1, 3R, 4, 4X and 12
- Available to 600 VAC, 50 or 60 Hz
- Suitable for emergency and standby applications on all classes of load, 100% tungsten rated through 400 amperes
- UL 1008 listed at 480 VAC
- CSA C22.2 No. 178 certified at 600 VAC
- IEC 947-6-1 listed at 480 VAC
Performance Features
- Adjustable, time delay in centered "off" position to meet specific installation requirements
- High close-in and withstand capability
- Temperature rise test per UL 1008 conducted after overload and endurance tests in unventilated enclosure?2014exceeds UL requirements
- Available in ZTS (utility-generator), ZTSU (utility-utility), ZTSG (generator-generator) and ZTSM (manual) configurations
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
- Control circuit disconnect plug and drive inhibit switch for safe maintenance
- Components accessible for inspection and maintenance without removal of the switch or power conductors
- Mechanical indicator and contact chamber cover designed for inspection, safety and position designation
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