Description
Keystone HID Pulse Start Metal Halide Capacitor, Dry Film, 175W, 11uF, 370V
Keystone 175W Pulse Start Metal Halide Replacement Capacitor (CAP-175MPS)
The Keystone CAP-175MPS is an industrial-duty, metallized AC oil-filled replacement capacitor engineered specifically for 175-watt pulse start metal halide (ANSI M137 / M152) ballast circuits. Designed to deliver essential power factor correction (≥90% HPF) and ensure stable arc maintenance, this component features a hermetically sealed aluminum oval can, an internal safety discharge bleed resistor, and standard 1/4″ quick-connect spade terminals for commercial high bays, floodlights, parking garage luminaires, and canopy fixtures.
Key Features & Performance Benefits
- Circuit Reactance Compensation: Corrects inductive reactance on 175W CWA and super-CWA pulse start ballast circuits, maintaining high power factor (≥0.90) and reducing line current demand.
- Internal Safety Bleed Resistor: Features a factory-integrated discharge resistor across terminals to safely bleed off residual voltage within minutes after power is cut.
- Hermetic Oval Can Construction: Extruded seamless aluminum housing with a rolled compression header seal ensures complete moisture exclusion and prevents dielectric fluid leakage.
- Direct Replacement Compatibility: Standard physical footprint and mounting profile match core-and-coil ballast kits from Keystone, Philips Advance, and Universal Lighting Technologies.
- Safety Compliance: UL Recognized component (UL 810), CSA certified, utilizing environmentally friendly non-PCB dielectric fluid and an internal pressure-sensitive interrupter (PSI) for safe end-of-life disconnect.
Electrical & Physical Data
| Specification | Details |
|---|---|
| Primary Lamp Rating | 175W Pulse Start Metal Halide |
| ANSI Ballast/Lamp Code | M137, M152 (Pulse Start) |
| Capacitance | 11.0 µF ±3% (Microfarads) |
| Voltage Rating | 400V AC (50/60 Hz) |
| Operating Frequency | 50 / 60 Hz |
| Terminal Style | 1/4″ (0.250″) Quick-Connect Spade Terminals |
| Dielectric Medium | Non-PCB Biodegradable Oil Fluid |
Frequently Asked Questions
What does "CAP-175MPS" stand for in Keystone's catalog?
"CAP" designates a standalone replacement HID capacitor, "175" indicates the 175W lamp rating, "M" signifies Metal Halide lamp chemistry, and "PS" specifies Pulse Start circuit operation (ANSI M137 / M152).
Can this capacitor be used to replace a standard 175W probe start (ANSI M57) capacitor?
Only if the M57 ballast specifically requires 11 µF / 400V AC. Standard probe-start M57 ballasts typically utilize 11 µF capacitors rated at lower operating voltages (often 370V or 400V), but capacitor replacements must always match the microfarad rating and meet or exceed the original voltage specification printed on the ballast tag.
Does the CAP-175MPS include the high-voltage pulse starter ignitor?
No. The CAP-175MPS is strictly the standalone oil-filled capacitor. Pulse start systems require a separate starter ignitor (such as an IGN-MH-PS ignitor) to supply the 3–4kV ignition pulse to the lamp.
Spec Sheets
Download the official manufacturer documentation and specifications:
Additional Information
Our Part No: |
CAP-175MPS |
Mfr Part #: |
CAP-175MPS |
Manufacturer Material Code: |
WAH-98 |
Brand: |
Keystone |
Fixture Type HID: |
Metal Halide MH Capacitor |
Lamp: |
175W M137, M152 HID Pulse Start Metal Halide |
Watts: |
175W |
Voltage: |
370V |
Microfarad: |
11μF |
Dimensions: |
1.38" Dia x 3.07"H |
Start Method: |
Pulse Start |
Product Data Sheet: |
See PDF Link Provided |
Energy Certification: |
RoHS |
Case Size: |
10 |
