Keystone KTAT-150-480-277-OC-C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$117.30
$67.30
Keystone KTAT-150-480-277-OC-CP 480V Step Down Autotransformer. 480V to 277V

Keystone KTAT-150-480-277-OC-CP 480V Step Down Autotransformer. 480V to 277V

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Model: KTAT-150-480-277-OC-CP
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$117.30
$67.30
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480V Step Down Autotransformer. 480V to 277V

KTAT-150-480-277-OC-CP - spec sheet

Manufacturer Resources

Product Specs

Accessory Device:
No
Cec T20:
No
Dlc:
No
Dlc Premium:
No
Energy Star:
No
Input Voltage:
347-480
Led Module Included:
No
Max Load:
150VA
Not Suitable For Sale In California:
No
Output Voltage:
277
Product Weight:
2 lbs
T24 Ja8:
No
Ul:
No
Warranty Years:
5
Wire Type:
Standard Wire Leads
Wireless Control:
No
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Transformers
Product Type:
General Purpose Transformer

Keystone KTAT-150-480-277-OC-CP – Frequently Asked Questions

1) Will the Keystone KTAT-150 autotransformer run a 277V fixture off a 480V circuit?
Yes. The KTAT-150-480-277-OC-CP accepts an input of 347 to 480 volts and steps it down to a 277 volt output, so a 277V-only ballast or LED driver can be fed from a 480V branch circuit. Load on the secondary has to stay at or below 150VA.
2) How many fixtures can I put on one KTAT-150 step down transformer?
Size by total VA, not fixture count. The KTAT-150 is rated for a 150VA maximum load on the 277V side, so add up the input wattage/VA of every driver or ballast you plan to feed and keep the total under 150VA. A single 150W-class fixture will exceed it; several low-wattage LED drivers typically will not.
3) Can I use this autotransformer on a 347V Canadian lighting circuit?
Yes. The input range on the KTAT-150 covers 347 to 480 volts, which includes the 347V distribution common in Canadian commercial buildings, and it outputs 277V.
4) Does the Keystone KTAT-150 come with terminals or does it wire with leads?
It wires with standard wire leads, so you splice it in with wire nuts or connectors inside the fixture or a junction box. There is no terminal block, and no mounting hardware or enclosure is described as part of the unit. At 2 lbs it is light enough to sit inside a typical fixture housing or box.
5) Is this an autotransformer or an isolation transformer? Does it matter for my install?
The KTAT-150 is an autotransformer, meaning the primary and secondary share a common winding. There is no galvanic isolation between the 480V side and the 277V side, so it is a voltage-matching device for lighting loads, not a way to isolate a circuit. If your spec calls for isolation between line and load, an autotransformer will not satisfy it.
6) Can the Keystone KTAT-150 be sold and installed in California?
Yes. The KTAT-150-480-277-OC-CP is not flagged as restricted from sale in California, and it carries no CEC Title 20 or Title 24 JA8 designation because those apply to lamps and luminaires rather than to a step down transformer.
7) Does this Keystone transformer include an LED module or any dimming control?
No. The KTAT-150 is a voltage step down device only. There is no LED module included, no wireless or networked control function, and it is not a dimming interface. Order your driver or ballast separately and feed it from the 277V output.
How fast can I get the Keystone KTAT-150-480-277-OC-CP delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Keystone KTAT-150-480-277-OC-CP come with a warranty?
Absolutely. The Keystone KTAT-150-480-277-OC-CP is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Keystone KTAT-150-480-277-OC-CP?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Keystone KTAT-150-480-277-OC-CP from ZenSupply?
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