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Philips Advance 71A8271-001D - S50/M168 HID Ballast - 250W High Pressure Sodium - 120/208/240/277V

Philips Advance 71A8271-001D - S50/M168 HID Ballast - 250W High Pressure Sodium - 120/208/240/277V

  • $115.95
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This product is a Philips Advance 71A8271-001D high pressure sodium core and coil magnetic ballast.

Philips Advance HID ballasts are available to operate the wide variety of metal halide, high pressure sodium and low pressure sodium lamps available in today's marketplace.

Like fluorescent, HID lamps are gas discharge lamps. Light is produced by an arc discharge between two electrodes located at opposite ends of an arc tube within the lamp's outer glass envelope. The ballast is the lamp's power supply; its purpose is to provide proper starting and operating voltage and current to initiate and sustain this arc.

Core and Coil

The basic ballast is the open core and coil, which is most often used as a component within a lighting luminaire. The core and coil also forms the nucleus of the five other ballast configurations detailed in this section. It consists of either one or two copper coils on a core (or "stack") of electricalgrade steel laminations. The coils are assembled to core sections that are then surface-welded together. The assembled Philips Advance ballast is vacuum-pressure impregnated with a silica-filled polyester varnish to re-enforce the electrical insulation, preclude moisture, inhibit noise and dissipate heat. Some HID ballast manufacturers apply varnish via a preheat-and-dip process, which only puts a thin coat of varnish on the outer surface of the ballast. Philips Advance core and coil ballasts feature as standard an insulation system rated class H (180°C maximum coil hot spot temp.) for ballasts below 600W and Class N (200°C maximum coil hot spot temp.) for ballasts 600W and higher. When performing in-fixture testing, the maximum allowable average coil temperature (measured by the rise-of-resistance method) is 165°C for Class H ballasts or 185°C for Class N ballasts. The maximum allowable coil face or lead wire temperature (measured by thermocouple) is 150°C for both Class H and Philips Advance Class N ballasts, 170°C for true Class N ballasts.

About Philips Advance

Philips Advance is one of North American's leading manufacturers of fluorescent and HID ballasts, as well as LED drivers. The company has been in business for over 50 years, earning a reputation in the industry for quality, reliability, and innovation. Advance supplies electronic and magnetic ballasts to OEMs and through distributors, and is one of the industry's most trusted brands.

ANSI CodeS50/M168
Ballast TypeMagnetic
Input Frequency60 Hz
Input Volts120/208/240/277
Lamp TypeHigh Pressure Sodium
Lamp Watts250
StyleCore and Coil

ProLampSales Order Code6617063882952
BrandPhilips Advance
MPN71A8271-001D

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