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ARC Keeper®, e-ARC Keeper™ and Arctic ARC Keeper
The Philips Bodine ARC Keeper® family (ARC Keeper® HID Backup Ballasts and e-ARC Keeper™ for 20-39 W Electronic HID Ballasts) is designed to eliminate nuisance downtime in HID metal halide lighting systems and allow HID fixtures to serve as emergency lighting units. ARC Keepers work by preventing the lamp arc from extinguishing during short-duration AC utility power disturbances. No arc loss means no need for the lengthy restrike periods common to HID systems.
ARC Keeper models are available for pulse-start and probe-start lamps (PLS and PRB), extended temperature ranges (Arctic™ ARC Keeper) and low-wattage applications (e-ARC Keeper). ARC Keeper HID Backup Ballasts are ideal for gymnasiums, parking garages, hangars, warehouses and other high-bay installations. e-ARC Keepers are suited to low-ceiling, low-wattage uses such as retail stores and lobbies.
Which version is right for you?


| Probe-Start Models |
| Model |
Lamp |
| AK175PRB |
175 W or energy-saving 150 W Metal Halide |
120 VAC, 600 mA, 6 W
277 VAC, 800 mA, 10 W |
| AK250PRB |
250 W or energy-saving 225 W Metal Halide |
120 VAC, 600 mA, 6 W
277 VAC, 800 mA, 10 W |
| AK400PRB |
400 W or energy-saving 360 W Metal Halide |
120 VAC, 310 mA, 4 W
277 VAC, 320 mA, 4 W |
| AK400PRB-SP |
400 W or energy-saving 360 W Metal Halide |
For use without an unswitched line
120 VAC, 310 mA, 4 W
277 VAC, 320 mA, 4 W |
Pulse-Start Models |
| Model |
Lamp |
| AK400PLS |
200 to 400 W Metal Halide |
120 VAC, 500 mA, 6 W
277 VAC, 500 mA, 9 W |
| AK400PLS-208V |
200 to 400 W Metal Halide |
120 VAC, 500 mA, 6 W
208 VAC, 500 mA, 9 W |
| AK400PLS-240V |
200 to 400 W Metal Halide |
120 VAC, 500 mA, 6 W
240 VAC, 500 mA, 9 W |
| AK175PLS |
100 to 175 W Metal Halide |
120 VAC, 500 mA, 6 W
277 VAC, 500 mA, 9 W |
| AK175PLS-208V |
100 to 175 W Metal Halide |
120 VAC, 500 mA, 6 W
208 VAC, 500 mA, 9 W |
| AK175PLS-240V |
100 to 175 W Metal Halide |
120 VAC, 500 mA, 6 W
240 VAC, 500 mA, 9 W |
Arctic Pulse-Start Models |
| Model |
Lamp |
| Arctic 175PLS |
100 to 175 W Metal Halide |
120 VAC, 360 mA, 17 W
208 VAC, 360 mA, 17 W
240 VAC, 360 mA, 17 W
277 VAC, 360 mA, 17 W
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e-ARC Keeper |
| Model |
Lamp |
| eAK39-120V |
20 W to 39 W Metal Halide |
| 120 VAC, 60 Hz, 80mA, 5 W
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| eAK39-277V |
20 W to 39 W Metal Halide |
| 277 VAC, 60 Hz, 40mA, 6.5 W
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