This article systematically analyzes the structural differences, performance parameters and applicable scenarios of OT terminals and SC terminals. Combining GB/T14315 and IEC61238 standards, this article builds a comparison system including electrical performance, mechanical strength and environmental adaptability, and provides a selection decision model based on application scenarios to help engineers accurately match connection solutions.
Structural Differences
|
0T terminal |
SC terminal |
| Structural Design |
Open-type terminal, no cover at the tail, requires external heat shrink tubing |
Peep-type terminal, tail PVC sheath integrated molding |
| IP Rating |
Basic protection, requires additional insulation treatment |
IP65 grade sealing protection, can reach IP67 after crimping |
| Termination Method |
Single crimping, wire crimping |
Double crimping, wire + insulation layer double fixed, tensile strength increased by 40% |
| Application |
Power distribution cabinet, motor wiring, industrial equipment |
New energy vehicle battery connection, outdoor humid environment |
Performance Comparison
1. Electrical performance
1) Current carrying:
OT terminal: 10mm² wire can carry 50A (GB/T14315 standard)
SC terminal: 25mm² wire can carry 150A (integrated heat dissipation structure)
2) Contact resistance:
OT terminal: ≤50uΩ (copper tinning process)
SC terminal: ≤30uΩ (full shielding design
2. Mechanical properties
1) Vibration resistance:
OT terminal: terminal retention force>50N (GB18384 standard)
SC terminal: double lock structure, tensile strength 2300N
2) Plug and unplug life:
OT terminal: 250 times (non-charging scenario)
SC terminal: 21000 times (high-frequency vibration scenario)
3. Environmental adaptability
| Environmental type |
OT terminal adaptability |
SC terminal adaptability |
| High temperature (>85°C) |
High temperature resistant insulation material needs to be selected |
Gold-plated contacts support -40~125°C |
| Humid/salt spray environment |
Three anti-corrosion paint needs to be applied additionally |
Native IP65 protection (96h salt spray corrosion-free) |
| Mechanical vibration scenario |
Anti-loosening gasket needs to be installed |
Flange design (DIN 46228 standard/standard) |
Selection Suggestions
1. Current demand orientation
≤60A conventional current: OT series is preferred (cost reduction of 30%)
>60A high current: SC series (integrated liquid cooling heat dissipation channel)
2. Environmental risk assessment
Dry indoor environment: OT terminal + heat shrink tubing (optimal overall cost)
Humidity/vibration scenario: mandatory use of SC terminal (failure rate reduced by 47%)
3. Installation space restrictions
Dense wiring scenario: OT right-angle opening type (adapt to 90° corner)
Vertical installation requirements: SC straight and shaped (180° opening design)
4. Maintenance cost considerations
High-frequency maintenance scenario: SC double crimping structure (reduce the probability of loosening)
Long-term maintenance-free requirements: OT silver-plated terminals (anti-oxidation life ≥10 years)
Application
| Industry |
Recommended type |
Core advantages |
| Industrial distribution cabinet |
OT terminal |
Low cost, fast installation |
| New energy vehicle high voltage system |
SC terminal |
IP67 protection, anti-vibration design |
| Outdoor photovoltaic inverter |
SC terminal |
Salt spray corrosion resistance, double lock to prevent loosening |
| Household appliance wiring |
OT terminal |
Pre-insulated sheath to prevent electric shock |
Use bare OT terminals in humid environments → Choose SC or add IP68 heat shrink tube
2. Ignore material differences: Use brass SC terminals for high current scenarios → Choose copper material to reduce resistance
3. Crimping process errors: OT terminal stripping length exceeds 2mm, resulting in poor contact → Strictly control according to L1=L+1~2mm
