A motor start capacitor provides a high-torque electrical boost to start single-phase AC motors. It connects temporarily during startup (max 3 seconds per start) and disconnects after the motor reaches operating speed. Our start capacitors use metallized polypropylene (MPP) film for reliable intermittent-duty operation.
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Key Takeaway
NR Capacitor manufactures Motor Start Capacitors (30–120 µF, 275 VAC) in Hosur, Tamil Nadu. Built with self-healing metallized polypropylene film, low dissipation factor (≤0.015 @ 120Hz), ISO 9001:2015 certified, 100% tested. 3,000+ start life at rated conditions. Ideal for ACs, refrigerators, pumps, compressors. Request a quote →
- For: OEMs, distributors, procurement teams buying motor start capacitors in bulk
- Capacitance: 30–120 µF | Voltage: 275 VAC (330V/440V custom)
- Lead time: 7–10 business days standard | 15–20 days custom
- MOQ: 500 units standard | Custom MOQs on request
Product Overview
Intermittent-Duty
Intermittent-Duty
Starting Power
Our Motor Start Capacitors are purpose-built to deliver the high-torque burst required for reliable single-phase motor starting. Each capacitor is built with premium metallized polypropylene (MPP) film dielectric, delivering stable capacitance across the full 30–120 µF range at a 275 VAC rating with a standard tolerance of ±10%. Low dissipation factor (tan δ ≤ 0.015 @ 120Hz) and a maximum 3-second startup time per start ensure exceptional thermal and electrical stability.
Designed for applications that demand short, powerful starting bursts — from air conditioners, refrigerators, and washing machines to water pumps, air compressors, and garage door openers — our motor start capacitors handle 20–30 starts per hour with consistent performance. Housed in plastic or aluminium cases with P0 safety class (intermittent duty) and rated for the Class C operating range (-25°C to +85°C), with a proven 3,000+ start life at rated conditions.
Key Features
Why Choose Our
Why Choose Our
Motor Start Capacitor
Self-Healing Technology
Automatic recovery from dielectric breakdown ensures long operational life and reliability under voltage surges during motor starting.
Low Dissipation Factor
tan δ ≤ 0.015 @ 120Hz minimizes energy losses during the high-current starting burst, improving startup performance.
Flame-Retardant Case
UL 94 V-0 rated plastic and aluminium housings provide maximum safety in residential, commercial, and industrial environments.
Class C Temperature Range
Operates reliably from −25°C to +85°C (Class C), suitable for extreme environmental conditions.
High Starting Torque
Delivers a powerful 3-second starting burst required for single-phase motors, ensuring reliable startup every time.
ISO 9001:2015 Certified
Manufactured in ISO 9001:2015 compliant facility meeting international quality standards.
±10% Tolerance
Standard ±10% capacitance tolerance for consistent and predictable motor starting performance.
P0 Safety Class
Intermittent (P0 class) protection with self-healing dielectric for fail-safe starting operation.
3,000+ Start Life
Engineered for 3,000+ starts at rated conditions, handling 20–30 starts per hour across the product lifetime.
Need bulk pricing or custom dimensions for your project?
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Technical Data
Detailed
Detailed
Specifications
Electrical Specifications
| Capacitance Range | 30 µF – 120 µF |
| Voltage Rating (AC) | 275 VAC |
| Tolerance | ±10% |
| Dielectric Material | Metallized Polypropylene (MPP) |
| Dissipation Factor (tan δ) | ≤ 0.015 @ 120Hz |
| Startup Time | Max 3 seconds per start |
| Starts / Hour | 20–30 (varies by rating) |
Mechanical & Environmental
| Operating Temperature | −25°C to +85°C (Class C) |
| Case Material | Plastic / Aluminium |
| Life Expectancy | 3,000+ starts @ rated conditions |
| Duty Cycle | Intermittent (P0 class) |
| Certification | ISO 9001:2015 |
Unsure about technical specs? Speak directly with our capacitor engineers.
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Applications
Motor Start
Motor Start
Capacitor Applications
Motor Start Capacitors are essential components in a wide range of single-phase AC motor applications that require a high-torque starting burst.
Air conditioning units and compressors
Refrigerators and freezers
Washing machines and dryers
Water well and irrigation pumps
Air compressors
Power tools and machinery
Garage door openers and gate motors
Commercial kitchen equipment
From Our Factory Floor
Our MPP motor start capacitors are validated through 3,000+ start-cycle endurance testing at rated conditions before batch clearance. In our Hosur facility, every capacitor is tested for capacitance (±10% tolerance), dissipation factor (DF ≤ 0.015 @ 120Hz), and a 2× voltage surge withstand per IEC 60252-1 standard before dispatch. Start capacitors are also duty-cycle verified to confirm they disconnect cleanly after the 3-second start phase, protecting the motor from heat build-up.
Testing conducted at NR Capacitor manufacturing facility, Bagalur, Hosur, Tamil Nadu — data on file.
FAQs
Frequently Asked
Frequently Asked
Questions
Quick answers to the most common questions from our OEM and procurement customers.
A start capacitor is designed for intermittent (P0 class) duty — it provides a high surge of current to start the motor and is then switched out. A run capacitor stays in the circuit continuously to improve efficiency. Start capacitors have higher capacitance (30–120 µF) and shorter per-start duty time (max 3 seconds).
30 µF to 120 µF capacitance at 275 VAC standard, with ±10% tolerance. Custom 330V and 440V ratings available on request. Operating at 50/60 Hz across Class C temperature range (–25°C to +85°C).
Engineered for 3,000+ starts at rated conditions, with a typical duty cycle of 20–30 starts per hour. Each start is rated for a maximum of 3 seconds to ensure long operational life.
Metallized polypropylene (MPP) film dielectric with self-healing construction. Housed in plastic or aluminium cases, both meeting ISO 9001:2015 quality standards for safety and reliability.
Yes. We are a preferred supplier to OEMs manufacturing air conditioners, refrigerators, washing machines, water pumps, and air compressors. We offer custom capacitance values, termination types, and branded packaging for bulk orders. Minimum order quantities apply.
Standard orders dispatch within 7–10 business days. Custom specifications may require 15–20 business days depending on complexity and volume.
ISO 9001:2015 certified manufacturing facility. 100% end-of-line testing for capacitance, dissipation factor, voltage withstand, and insulation resistance. Compliant with IEC 60252 and UL 810 standards.
Yes, we provide samples for qualified OEMs and distributors. Sample requests are processed within 3–5 business days. Shipping charges may apply.
Selection Guide
How to Select the Right
How to Select the Right
Motor Start Capacitor
Follow these 7 steps to specify the correct capacitor for your motor starting application.
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Identify your motor type and starting requirement
Confirm single-phase AC motor. Determine if you need intermittent start duty (capacitor disconnects after startup) vs. continuous run duty.
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Determine required capacitance (µF)
Check motor nameplate or existing capacitor for rated µF. For start capacitors, typical range is 30–120 µF. Undersizing = weak starting torque; oversizing = excessive current and motor damage.
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Select voltage rating — must meet or exceed circuit voltage
Standard is 275 VAC. Custom 330V and 440V available. Capacitor voltage rating must be ≥ your motor's operating voltage for reliable starting and surge protection.
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Choose MPP film dielectric for start capacitors
MPP (metallized polypropylene) provides the high surge current capability needed for motor starting, with self-healing properties for intermittent-duty reliability. Dissipation factor ≤0.015 @ 120Hz.
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Verify operating temperature and duty cycle
Class C: –25°C to +85°C. Rated for 20–30 starts per hour, max 3 seconds per start. For high-cycle applications (e.g., commercial refrigeration), confirm duty cycle with our engineering team.
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Check certification needs for your market
India domestic: ISO 9001, IEC 60252. Export: UL 810, CE, RoHS. Our capacitors meet all major standards — confirm specific requirements for your target market.
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Contact NR Capacitor for a quote and engineering confirmation
Share motor nameplate data, required µF, voltage, quantity, and any custom termination needs. Our team confirms the optimal part number and provides a formal quotation within 24 hours.
Need Help Selecting the Right Motor Start Capacitor?
Our application engineers in Hosur can help you with capacitor sizing, voltage selection, custom termination, and bulk OEM pricing. Get a technical response within 24 hours — no obligation.
Get in Touch
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Enquire About This
Product
Interested in our Motor Start Capacitors? Reach out for pricing, samples, or technical specifications.
Our Address
Ground Floor 5/150, NR Farms, Venkatapuram Road, Bagalur Post, Hosur Taluk, Tamil Nadu - 635103
Phone
+91 98765 43210
Email
sales@nrcapacitor.com
Business Hours
Mon – Sat: 9:00 AM – 6:00 PM
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