Overview
The COMAR MK-450-20 is a heavy-duty motor start capacitor designed for single-phase electric motor applications. Rated at 450 VAC with 50/60 Hz operating frequency and ±5% capacitance tolerance, this capacitor features a self-healing MKP dielectric and safety class S0 rating. The 20 µF capacitance value makes it suitable for correcting motor power factor and enabling reliable motor starting in industrial and commercial environments.
Key Features
- Self-Healing MKP Dielectric: Metallized polypropylene construction with low shrinkage and high mechanical properties ensures longevity and fault tolerance.
- Heavy-Duty Operating Class: 420 V – A 30000 h (HPFNS) / 450 V – B 10000 h (HPFNT) rating for reliable performance under demanding conditions.
- M8 Stud Mounting: 6.3 mm fast-on double tags with M8 x 10 mm stud, complete with externally toothed anti-shake washer and M8 nut.
- Motor Run & Start Applications: Designed for permanent connection to motors to improve power factor during rated load operation.
- Compact Design: Plastic casing with integrated lead-out cable for easy installation.
Technical Specifications
- Rated Voltage: 450 VAC
- Capacitance: 20 µF
- Frequency: 50/60 Hz
- Capacitance Tolerance: ±5%
- Dielectric Type: Self-healing MKP (metallized polypropylene)
- Operating Class A: 420 V – 30,000 hours (HPFNS)
- Operating Class B: 450 V – 10,000 hours (HPFNT)
- Safety Class: S0
- Dissipation Factor: < 5 × 10⁴
- Insulation Resistance: < 1 × 10⁵ MΩ × µF
- Mounting: M8 stud with washer and nut
- Weight: 0.35 lbs (0.16 kg)
- Termination: 6.3 mm fast-on double tags
Typical Applications
The COMAR MK-450-20 is commonly used in:
- Single-phase motor power factor correction
- Motor starting circuits for industrial pumps and compressors
- HVAC motor run capacitors
- Machine tool motor starting
- Agricultural and construction equipment motors
- Commercial refrigeration and air conditioning systems
Compatibility & Replacements
Compatible With
- Single-phase AC motor circuits (50/60 Hz)
- Motor run and motor start applications
- Power factor correction systems
- Standard 450 VAC electrical installations
- M8 stud-mounted capacitor holders
Replaces / Drop-In Replacement For
- Earlier COMAR MK-450-20 units
- Legacy 450 VAC, 20 µF motor start capacitors with M8 mounting
- Compatible with applications designed for heavy-duty operating class ratings
Works With
- Single-phase 50/60 Hz power systems
- Motor protection relays and thermal overload devices
- Industrial VFD systems (verify capacitor compatibility with drive specifications)
- Motor starting contactors and soft starters
