ABB OTDC25UST2 2-pole single-circuit US door-mounted PV disconnect switch rated at 25 A for 600 V DC UL and 660 V DC IEC applications.
The ABB OTDC25UST2 (1SCA134578R1001) is a compact and dependable DC PV disconnect switch engineered to provide safe isolation for photovoltaic (PV), battery energy storage and industrial direct current applications. As part of the trusted ABB OTDC switch disconnector series, it delivers reliable switching performance while complying with IEC 60947-3 and UL 508i standards for renewable energy installations.
Designed for OEMs, panel builders and electrical contractors, the OTDC25UST2 features a 2-pole single-circuit US door-mounted configuration with a factory-fitted jumper, making it ideal for photovoltaic combiner boxes and renewable energy systems. Its compact footprint, touch-safe IP20 terminals and flexible installation simplify panel assembly while ensuring dependable long-term performance.
With a 25 A operational rating at 600 V DC (UL) and 25 A at 660 V DC (IEC), the ABB OTDC25UST2 provides dependable DC isolation for solar installations and industrial DC applications. A terminal bolt kit is included, while compatible operating handles and shafts are supplied separately.
DC disconnect switches provide a safe means of isolating photovoltaic strings during installation, maintenance and servicing. The ABB OTDC range has been specifically developed for renewable energy applications, delivering dependable switching performance and long service life in demanding operating environments.
The OTDC25UST2 combines ABB's proven engineering with compact construction, enabling straightforward integration into photovoltaic arrays, battery storage systems and industrial DC installations while maintaining high levels of safety and reliability.
| Current | 40 A |
|---|---|
| Voltage | 000 V |
| IP Rating | IP20 |
| Manufacturer | ABB |
| Series | OTDC Switch Disconnectors |
| Model | OTDC25UST2 |
| MPN | 1SCA134578R1001 |
| Product type | DC PV disconnect switch |
| Rated operational current (UL) | 25 A at 600 V DC |
| Rated operational current (IEC) | 25 A at 660 V DC |
| Rated insulation voltage (Ui) | 1000 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Number of poles | 2 |
| Configuration | Single circuit (US type) |
| Protection rating | IP20 |
| Mounting type | Door mounting |
| Terminal capacity | 2.5 to 16 mm² (12 to 6 AWG) |
| Dimensions (H × W × D) | 74 × 54.5 × 64 mm |
| Weight | Approx. 0.15 kg |
| Supplied with | Factory-fitted jumper and terminal bolt kit |
| HS Code | 85365080 |
| Country of Manufacture | Estonia |
The OTDC25UST2 is a DC PV disconnect switch designed to safely isolate photovoltaic strings and other direct current circuits during maintenance and servicing.
The switch is rated at 25 A at 600 V DC (UL) and 25 A at 660 V DC (IEC).
Yes. The OTDC25UST2 is supplied with a factory-fitted jumper for simplified installation.
No. The switch includes a terminal bolt kit, while compatible operating handles and shafts are supplied separately.
It is commonly installed in photovoltaic combiner boxes, battery energy storage systems and industrial DC control panels requiring safe circuit isolation.
ABB OTDC disconnect switches are trusted by solar installers, electrical contractors and panel builders for delivering dependable DC isolation across photovoltaic and industrial renewable energy systems.
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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...