When standard DT connectors aren't enough - for high-current power distribution, heavy truck applications, or harsh environment installations - the Deutsch HDP20 series is the answer. Here's a complete guide.
What Is the HDP20 Series?
The HDP20 (Heavy Duty Power, 20 Series) is Deutsch's heavy-duty connector family designed for high-current, high-vibration, and extreme environment applications. Where the DT series handles signal and moderate power (up to 13A per contact), the HDP20 is built for serious power distribution.
Key Specs
- Current rating: Up to 40A per contact (size 12) or 70A (size 8)
- Voltage rating: 600V AC/DC
- Temperature range: -67�F to +257�F
- IP rating: IP69K - survives high-pressure washdowns
- Pin configurations: 2, 3, 4, 6, 8 positions
- Contact sizes: Size 8 (70A), Size 12 (40A), Size 16 (13A) - can mix in same housing
HDP20 vs DT Series: When to Choose HDP20
| Feature | DT Series | HDP20 Series |
|---|---|---|
| Max current per contact | 13A (size 16) | 70A (size 8) |
| IP rating | IP67 | IP69K |
| Mixed contact sizes | No | Yes |
| Best for | Signal, sensors, lighting | Power distribution, motors, high-draw accessories |
| Typical applications | Trailer wiring, ECU connectors | Winches, hydraulics, high-current lighting |
HDP20 Contact Sizes Explained
One of the most powerful features of the HDP20 is the ability to mix contact sizes in a single housing - allowing you to run both power and signal through one connector.
- Size 8 contacts: 70A rating, for wire 8-4 AWG - power circuits
- Size 12 contacts: 40A rating, for wire 14-10 AWG - medium power
- Size 16 contacts: 13A rating, for wire 20-14 AWG - signal and low power
Example: A 6-position HDP20 housing can carry 2x size 8 contacts (battery power + ground) and 4x size 16 contacts (control signals) - all through one weatherproof connector.
Common HDP20 Applications
- Heavy truck/semi: Cab-to-trailer power, PTO connections, auxiliary equipment
- Agricultural equipment: Combine headers, planter connections, hydraulic controllers
- Construction equipment: Crane controls, excavator attachments, generator connections
- Marine/offshore: Bilge pumps, thruster motors, power distribution panels
- Off-road/military: Winch power, recovery equipment, auxiliary lighting systems
- RV/motorhome: Shore power connections, slide-out motors, generator transfer
HDP20 Assembly Tips
- Use the correct crimper: Size 8 contacts require a heavy-duty crimper (Deutsch W-HT-1921 or equivalent). Size 12/16 use the standard Deutsch crimper.
- Verify contact orientation: HDP20 contacts have a specific orientation - the inspection hole must face outward for proper seating verification.
- Use cavity plugs for all unused positions - HDP20 IP69K rating requires all cavities sealed.
- Apply dielectric grease sparingly on contact mating surfaces in marine or salt environments.
- Torque the coupling nut: HDP20 uses a threaded coupling ring - hand tighten plus 1/4 turn for secure mating.
Shop Deutsch HDP20 Connectors
We carry Deutsch HDP20 housings, contacts in all sizes, cavity plugs, and assembly tools.
