ABB OTDC25US4 4-pole double-circuit US PV disconnect switch rated at 25 A for 600 V DC UL and 660 V DC IEC applications, designed for photovoltaic systems and industrial DC isolation.
The ABB OTDC25US4 (1SCA134379R1001) 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 OTDC25US4 features a 4-pole double-circuit US configuration, making it ideal for isolating multiple photovoltaic strings. Its compact footprint, touch-safe IP20 terminals and flexible base or DIN rail mounting simplify installation 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 OTDC25US4 provides dependable DC isolation for solar installations and other demanding direct current applications. The switch is supplied with a terminal bolt kit, while compatible operating handles and shafts are ordered 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 OTDC25US4 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 |
| Phase | Three Phase |
| IP Rating | IP20 |
| Manufacturer | ABB |
| Series | OTDC Switch Disconnectors |
| Model | OTDC25US4 |
| MPN | 1SCA134379R1001 |
| 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 | 4 |
| Configuration | Double circuit (US type) |
| Protection rating | IP20 |
| Mounting type | Base or DIN rail mounting |
| Terminal capacity | 2.5 to 16 mm² (12 to 6 AWG) |
| Dimensions (H × W × D) | 89 × 54.5 × 87 mm |
| Weight | Approx. 0.15 kg |
| Supplied with | Terminal bolt kit |
| HS Code | 85365080 |
| Country of Manufacture | Estonia |
The OTDC25US4 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).
The OTDC25US4 features a 4-pole double-circuit US configuration for isolating multiple PV strings.
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.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...