The shore power SM connector is a high-current sealed electrical connector specifically designed for charging ships and submarines when they are docked. It is an important branch of the SM series of circular connectors, specially developed to meet the requirements of high corrosion, high water pressure and high power transmission in marine environments.
The core advantage of the shore power SM connector lies in its deep-sea sealing, ultra-large current transmission, and military-grade shock resistance. It is a specialized solution specifically designed to address the challenge of "ensuring the safe and reliable connection of large-power shore power to ships in complex marine environments".
| Operating Temperature | -55~+125℃ |
|---|---|
| Vibration | Frequency 10~2000Hz, Acceleration 196m/s² |
| Shock (Bump) | Acceleration 100m/s² |
| Insulation Resistance | ≥ 500MΩ at Normal Temperature ≥ 100MΩ under Damp Heat |
| Withstand Voltage | 2500V |
| Mechanical Life | 500 cycles |
| Hydrostatic Pressure Resistance | 0~4.5Mpa |
Contact Resistance and Rated Current of Contacts
| Contact Diameter (mm) | Φ9.1 | Φ12 | Φ20 | Φ24 |
|---|---|---|---|---|
| Contact Resistance (mΩ) | ≤1.0 | ≤0.5 | ≤0.13 | ≤0.05 |
| Rated Current (A) | 150 | 250 | 600 | 800 |
Naval Shore Power: Charging for submarines and warships at dock.
Vessel Shore Connection: Shore power access for cruise ships and cargo vessels in ports.
Platform Power Supply: Power transmission for offshore drilling platforms.
Bulkhead Penetration: Sealed through-hull electrical connections.
Underwater Equipment: Power supply for submersibles and deep-sea devices.
Port Machinery Power: Power access for heavy equipment like quayside cranes and ship unloaders.
Multi-layer Sealing: Utilizes end-face seals, tail sealing nuts, and an independent protective cap to achieve long-term sealing at 380 meters underwater and resistance to wave splash.
Wire Socket Contacts: Employs wire basket socket contacts internally, enabling multi-point contact with low contact resistance, minimal temperature rise, and high resistance to vibration and shock.
Threaded Coupling: The plug and receptacle are locked with high-strength threads to prevent loosening from cable strain or wave impact.
Corrosion-Resistant Shell: The housing is made of stainless steel or naval brass with nickel or chrome plating, suitable for high-salt-spray marine environments.
High-Voltage Insulation: Uses high-performance insulating materials with increased creepage distance to ensure 2500V withstand voltage and high insulation resistance under damp heat conditions.
Vibration-Resistant Fixation: Contacts are securely fixed with pins or snap rings to meet the 10~2000Hz wide-frequency vibration requirements.

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Q:What is the waterproof depth?
A: When unmated, the receptacle with its protective cap can withstand 380 meters underwater; when mated, it is resistant to wave splash and rain.
Q:What is the maximum current?
A: The maximum is 800A (for Φ24 contacts), with a corresponding contact resistance of ≤0.05mΩ.
Q: Isn't a threaded coupling too slow?
A: The threaded coupling ensures vibration resistance and anti-loosening, prioritizing safety. Given the low frequency of mating/unmating in shore power scenarios, this is acceptable.
Q:Will the housing rust?
A: The housing is made of 316L stainless steel or naval brass with nickel plating, providing excellent resistance to salt spray corrosion and preventing red rust.
Q: Can the contact resistance remain stable over time?
A: Yes. The wire socket contact structure ensures multi-point contact, maintaining stable resistance even after 500 mating cycles.
Choose the shore power SM connector when it involves underwater power supply (such as submarine charging or bulkhead penetration, requiring resistance to 380m water pressure), high-power shore power access for vessels (150A~800A), salt spray corrosion environments like offshore platforms, replacement of aging imported military-standard equipment (MIL-C-24368A), or situations with strong vibration requiring reliable contact.
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