ABB OTDC32UST4 DC switch disconnector with 32 A operational current, 1000 V DC IEC rating and four-pole double circuit configuration for photovoltaic and industrial DC isolation.
The ABB OTDC32UST4 (1SCA136706R1001) is a compact and dependable DC switch disconnector engineered for photovoltaic (PV) installations and industrial direct current applications. As part of the proven ABB OTDC switch disconnector range, it provides safe isolation of DC circuits while delivering reliable switching performance for renewable energy systems and electrical control panels.
Designed with a 4-pole double circuit US configuration, the OTDC32UST4 is optimised for photovoltaic string isolation and complies with recognised IEC and UL standards. Its compact construction, flexible mounting options and robust switching mechanism make it an excellent solution for solar installers, panel builders and OEMs requiring reliable DC isolation.
With a 32 A rated operational current, 50 A conventional thermal current and a 1000 V DC IEC voltage rating, the ABB OTDC32UST4 is ideal for combiner boxes, PV inverters, battery storage systems and industrial DC distribution applications.
The ABB OTDC32UST4 provides a safe and effective means of isolating photovoltaic strings and other DC power circuits during maintenance or emergency shutdown procedures. Designed specifically for renewable energy installations, it delivers dependable switching performance while helping maintain electrical safety.
Its compact design and robust construction allow seamless integration into solar combiner boxes, inverter systems and industrial DC installations where reliable isolation is essential for safe operation.
| Current | 50 A |
|---|---|
| Voltage | 000 V |
| Phase | Three Phase |
| IP Rating | IP20 |
| Manufacturer | ABB |
| Series | OTDC Switch Disconnectors |
| Model | OTDC32UST4 |
| Manufacturer Part Number | 1SCA136706R1001 |
| Product type | DC switch disconnector |
| Rated operational current | 32 A |
| Rated thermal current (Iu) | 50 A |
| Rated voltage | 1000 V DC (IEC), 600 V DC (UL) |
| Number of poles | 4 |
| Configuration | Double circuit, US version |
| Mounting type | Door mounting |
| Connection type | Screw terminals |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 74 × 54.5 × 87 mm |
| Weight | approx. 0.15 kg |
| HS Code | 85365080 |
| Country of Manufacture | Estonia |
The OTDC32UST4 is designed to safely isolate photovoltaic arrays and other industrial DC electrical circuits.
The switch provides a 32 A operational current with a 50 A conventional thermal current.
It is rated for 1000 V DC under IEC standards and 600 V DC under UL standards.
No. The operating handle and shaft are supplied separately and should be ordered independently.
It is commonly installed in photovoltaic combiner boxes, inverter systems and industrial DC control panels requiring reliable circuit isolation.
ABB OTDC switch disconnectors are trusted worldwide by solar installers, panel builders and electrical engineers for providing dependable DC isolation in photovoltaic, battery storage and industrial power systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...