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1SCA134579R1001 ABB OTDC25UST4 4 Pole 1000VDC 40A Switch Disconnector
ABB OTDC25UST4 4-pole double-circuit US door-mounted PV disconnect switch rated at 25 A for 600 V DC UL, 660 V DC IEC and 16 A at 1000 V DC IEC applications.
Why Choose the ABB OTDC25UST4 PV Disconnect Switch?
The ABB OTDC25UST4 (1SCA134579R1001) 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 requirements for renewable energy installations.
Designed for OEMs, panel builders and electrical contractors, the OTDC25UST4 features a 4-pole double-circuit US door-mounted configuration, making it ideal for isolating multiple PV strings. 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), 25 A at 660 V DC (IEC) and 16 A at 1000 V DC (IEC), the ABB OTDC25UST4 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.
Key Advantages
- Compact DC PV disconnect switch for safe circuit isolation.
- 25 A switching capacity for higher current photovoltaic installations.
- 4-pole double-circuit US door-mounted configuration.
- Suitable for photovoltaic combiner boxes and battery energy storage systems.
- Touch-safe IP20 protected terminal clamps.
- Reliable ABB switching technology for demanding industrial environments.
Key Features
- ABB OTDC switch disconnector series.
- Model: OTDC25UST4.
- Manufacturer part number: 1SCA134579R1001.
- 25 A at 600 V DC (UL).
- 25 A at 660 V DC (IEC).
- 16 A at 1000 V DC (IEC).
- 4-pole double-circuit US configuration.
- Door-mounted version.
- Terminal bolt kit included.
- Handles and shafts available separately.
Reliable DC Isolation for Solar Energy Systems
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 OTDC25UST4 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.
Typical Applications
- Solar photovoltaic systems.
- PV combiner boxes.
- Battery energy storage systems.
- Industrial DC distribution panels.
- Renewable energy installations.
- OEM electrical control equipment.
Technical Specifications
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| Voltage | 1000 V | |
|---|---|---|
| Mounting Type | Door / front mounting | |
| Device Type | Switch Disconnector | |
| Supply Type | DC | |
| Product Series | ABB OTDC | |
| Current | 40 A | |
| Phase | Three Phase | |
| IP Rating | IP20 | |
| Poles | 4-pole | |
| Manufacturer | ABB | |
| Series | OTDC Switch Disconnectors | |
| Model | OTDC25UST4 | |
| MPN | 1SCA134579R1001 | |
| Product type | DC PV disconnect switch | |
| Rated operational current (UL) | 25 A at 600 V DC | |
| Rated operational current (IEC) | 16 A at 1000 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 | Door mounting | |
| Terminal capacity | 2.5 to 16 mm² (12 to 6 AWG) | |
| Dimensions (H × W × D) | 74 × 54.5 × 87 mm | |
| Weight | Approx. 0.15 kg | |
| Supplied with | Terminal bolt kit | |
| HS Code | 85365080 | |
| Country of Manufacture | Estonia |
Frequently Asked Questions
What is the ABB OTDC25UST4 used for?
The OTDC25UST4 is a DC PV disconnect switch designed to safely isolate photovoltaic strings and other direct current circuits during maintenance and servicing.
What are the voltage and current ratings?
The switch is rated at 25 A at 600 V DC (UL), 25 A at 660 V DC (IEC) and 16 A at 1000 V DC (IEC).
What configuration does the OTDC25UST4 use?
The OTDC25UST4 features a 4-pole double-circuit US configuration with door mounting for photovoltaic applications.
Does the switch include an operating handle?
No. The switch includes a terminal bolt kit, while compatible operating handles and shafts are supplied separately.
Where is the OTDC25UST4 typically installed?
It is commonly installed in photovoltaic combiner boxes, battery energy storage systems and industrial DC control panels requiring safe circuit isolation.
Trusted by Renewable Energy Professionals Worldwide
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.
