Overview
The Dayton 340-408MFD C-4X067-P is a non-polarized electrolytic motor start capacitor designed for intermittent duty in AC motor starting circuits. Rated at 340–408 microfarads (µF) and 110–125VAC, this capacitor is engineered to deliver the capacitive kick needed for single-phase motor applications including HVAC equipment, compressors, pumps, and fractional horsepower gear motors. Built with a rugged plastic case, it offers protection against oil, dirt, moisture, and grease in industrial environments.
Key Features
- Non-polarized design — aluminum electrolytic construction for normal intermittent AC motor starting service
- Wide microfarad range — 340–408 µF tolerance accommodates standard motor requirements
- 110–125VAC rated — suitable for low-voltage single-phase motor circuits
- Durable plastic case — molded enclosure protects against environmental contamination
- Universal compatibility — drop-in replacement for multiple OEM and aftermarket start capacitor models
Technical Specifications
| Capacitance Range | 340–408 µF (microfarads) |
| Voltage Rating | 110–125VAC |
| Frequency | 60 Hz |
| Capacitor Type | Non-polarized Electrolytic |
| Case Material | Plastic (Phenolic Resin) |
| Case Shape | Oval |
| Operating Temperature | –40°C to +65°C |
| Max Starts Per Hour | 20 |
| Certifications | UL Recognized (US & Canada) |
| Dayton Part Number | C-4X067-P |
| Reference Code | 340-408MFD |
Typical Applications
- Single-phase AC motor starting circuits in HVAC systems (furnace blowers, air handler units)
- Compressor and pump motors in refrigeration and pneumatic equipment
- Gear motor applications in industrial automation and material handling
- Fractional horsepower fan and blower motors
- Motor run and start circuits requiring 340–408 µF intermittent duty
Compatibility & Replacements
Compatible With
- Single-phase AC electric motors (fractional to 5 HP)
- HVAC equipment (furnaces, air handlers, heat pumps)
- Compressor and pump motor circuits
- Gear motor applications requiring motor start capacitance
- Standard 110–125VAC single-phase motor control circuits
Replaces / Drop-In Replacement For
- Aerovox 4X067
- MARS 11022
- JARD 11922
- Global 1022
- Vanguard BC-340
- Mallory PSU34015
- Supco CS340-408×110
- Other standard 340–408 µF / 110–125VAC motor start capacitors
Works With
- Single-phase AC motor control systems (no programmable logic required)
- HVAC compressor and blower motor circuits
- Centrifugal switch-activated motor starting circuits
- Standard relay and contactor-based motor starters
