Description
Keystone Dry Film Pulse Start (PS) Metal Halide Dry Film Capacitor, 250 Watt, 17uF, 400V
Keystone 250W Pulse Start Metal Halide Replacement Capacitor (CAP-250MPS)
The Keystone CAP-250MPS is an industrial-duty replacement capacitor engineered specifically for 250-watt pulse start metal halide (ANSI M138 / M153) ballast circuits. Designed to deliver power factor correction (≥90% HPF) and ensure stable arc maintenance across CWA systems, this component features a hermetically sealed aluminum oval can, an internal discharge safety bleed resistor, and standard 1/4″ quick-connect spade terminals for commercial high bays, area lighting, and outdoor floodlight luminaires.
Key Features & Performance Benefits
- Power Factor Correction: Restores circuit reactance balance to achieve high power factor (≥0.90 HPF) and minimizes total current draw across 250W CWA circuits.
- Internal Safety Bleed Resistor: Factory-installed discharge resistor safely drains high residual DC voltage within minutes after power interruption to prevent shock during maintenance.
- Hermetic Aluminum Can Construction: Extruded seamless aluminum housing with a rolled compression header seal prevents dielectric degradation under severe thermal cycling.
- Universal Retrofit Compatibility: Matches standard physical dimensions, mounting brackets, and electrical ratings found in Keystone, Philips Advance, and Universal core-and-coil 250W ballast kits.
- 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 failure disconnect.
Electrical & Physical Data
| Specification | Details |
|---|---|
| Primary Lamp Rating | 250W Pulse Start Metal Halide |
| ANSI Ballast/Lamp Code | M138, M153 (Pulse Start) |
| Capacitance | 17.0 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-250MPS" stand for in Keystone's catalog?
"CAP" designates a standalone replacement HID capacitor, "250" denotes the 250W lamp rating, "M" signifies Metal Halide lamp chemistry, and "PS" specifies Pulse Start circuit operation (ANSI M138 / M153).
How does the CAP-250MPS differ from a 250W probe-start capacitor?
Standard 250W probe start (ANSI M58) ballasts typically require a 15 µF / 400V AC capacitor, while pulse start M138 systems require 17 µF / 400V AC. Always verify the capacitance value printed on the original ballast tag prior to installation.
Does this capacitor include the starter ignitor?
No. The CAP-250MPS is strictly the standalone capacitor unit. Pulse start ballasts require an external electronic pulse ignitor (starter) in addition to the capacitor to deliver the strike pulse to the M138/M153 lamp.
Spec Sheets
Additional Information
Our Part No: |
CAP-250MPS |
Mfr Part #: |
CAP-250MPS |
Manufacturer Material Code: |
SNR-30 |
Fixture Type HID: |
Metal Halide MH Capacitor |
Type: |
Dry Film |
Lamp: |
250W M138 M153 HID Pulse Start Metal Halide |
Watts: |
250W |
Voltage: |
400V |
Microfarad: |
17μF |
Dimensions: |
3.68" H x 1.57" Dia |
Product Data Sheet: |
See PDF Link Provided |
Start Method: |
Pulse Start |
Energy Certification: |
RoHS |
Case Size: |
12 |
