Description
Keystone HID Pulse Start Metal Halide Capacitor, Oil filled, 750W M149, 28uF, 400V
Keystone 750W Pulse Start Metal Halide Replacement Capacitor (CAP-750MPS)
The Keystone CAP-750MPS is an industrial-grade, oil-filled dry/metallized AC replacement capacitor specifically engineered for 750-watt pulse start metal halide (ANSI M149) ballast circuits. Designed to deliver power factor correction (≥90% HPF) and ensure stable arc maintenance, this high-voltage component features a hermetically sealed aluminum oval can, built-in discharge resistor, and dual spade/quick-connect terminals engineered for heavy-duty commercial and industrial fixtures.
Key Features & Performance Benefits
- Precision Electrical Correction: Provides reactive power compensation to maintain a high power factor (≥0.90) and reduce current draw across 750W CWA (Constant Wattage Autotransformer) ballasts.
- Internal Discharge Resistor: Equipped with an integrated bleed-off resistor designed to safely discharge stored residual voltage within minutes after power interruption.
- Rugged Oval Metal Enclosure: Encased in an extruded, seamless aluminum housing with a compression-sealed header plate, preventing dielectric fluid leakage under high thermal stress.
- Universal HID Retrofit Compatibility: Matches standard physical mounting footprint and electrical ratings used in Keystone, Philips Advance, and Universal Lighting Technologies core-and-coil ballast kits.
- Safety Compliance: UL Recognized component (UL 810), CSA certified, utilizing non-PCB dielectric fluid and equipped with an internal pressure-sensitive interrupter (PSI) for fault isolation.
Electrical & Physical Data
| Specification | Details |
|---|---|
| Primary Lamp Rating | 750W Pulse Start Metal Halide |
| ANSI Ballast/Lamp Code | M149 |
| Capacitance | 30.0 µF ±3% (Microfarads) |
| Voltage Rating | 480V AC (50/60 Hz) |
| Operating Frequency | 50 / 60 Hz |
| Terminal Style | 1/4″ (0.250″) Quick-Connect Spade Terminals |
| Dielectric Medium | Biodegradable Oil / Non-PCB Fluid |
Frequently Asked Questions
What does "CAP-750MPS" stand for in Keystone's catalog?
"CAP" designates a standalone replacement HID capacitor, "750" denotes the 750W wattage pairing, "M" signifies Metal Halide lamp chemistry, and "PS" specifies Pulse Start circuit operation (ANSI M149).
Can this capacitor be used on standard probe start metal halide ballasts?
Only if the probe start ballast specifically requires a 30 µF / 480V rating. Pulse start circuits operate under distinct primary inductance and voltage requirements, so replacing a capacitor always requires matching the exact microfarad (µF) rating and meeting or exceeding the rated AC voltage.
Does the CAP-750MPS include the starter ignitor?
No. The CAP-750MPS is strictly the standalone oil-filled capacitor unit. Pulse start ballasts require a separate high-voltage electronic ignitor (starter) to deliver the initial strike pulse to the M149 lamp.
Spec Sheets
Download the official manufacturer documentation and specifications:
Additional Information
Our Part No: |
CAP-750MPS |
Mfr Part #: |
CAP-750MPS |
Manufacturer Material Code: |
ELN-49 |
Brand: |
Keystone |
Fixture Type HID: |
HPS Capacitor |
Lamp: |
750W M149 HID Pulse Start Metal Halide |
Watts: |
750W |
Voltage: |
400V |
Microfarad: |
28μF |
Dimensions: |
3.66" L, 1.97" W, 3.91" H |
Start Method: |
Pulse Start |
Product Data Sheet: |
See PDF Link Provided |
Energy Certification: |
RoHS |
Case Size: |
12 |
