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1SBL351024R7500 ABB UA50-30-00RA 200V 50Hz / 200-220V 60Hz Contactor
ABB UA50-30-00RA capacitor switching contactor with 3 normally open main poles, integrated damping resistors and a 200 V 50 Hz / 200–220 V 60 Hz AC control coil for industrial power factor correction systems.
£267.26
Why Choose the ABB UA50-30-00RA 200 V Contactor?
The ABB UA50-30-00RA, order code 1SBL351024R7500, is a specialised 3-pole capacitor switching contactor designed for power factor correction and reactive power compensation applications. As part of the ABB UA..RA contactor series, it is engineered for installations where the peak current during capacitor energisation can greatly exceed the nominal RMS current.
The UA50-30-00RA incorporates three normally open main poles and a special front-mounted resistor block. Three damping resistors are inserted serially during switching to limit the initial current peak, while the circuit also provides capacitor precharging to reduce the second current peak when the main poles close. This design enables effective switching of capacitor banks without requiring additional inductances.
This 1SBL351024R7500 version uses a 200 V AC 50 Hz / 200–220 V AC 60 Hz control coil. Designed specifically for demanding capacitor-switching duty, the contactor combines a robust block-type construction with integrated damping resistors for dependable operation in industrial power factor correction systems.
Key Advantages
- Purpose-designed 3-pole contactor for capacitor bank switching.
- 200 V AC at 50 Hz / 200–220 V AC at 60 Hz control voltage.
- Three normally open main poles for three-phase capacitor switching.
- Integrated three damping resistors help limit capacitor energisation current peaks.
- Precharging arrangement helps reduce the second current peak when the main contacts close.
- Suitable for installations where peak current can greatly exceed nominal RMS current.
- Designed for capacitor switching without additional inductances.
- Robust block-type construction for industrial power factor correction equipment.
Key Features
- ABB UA50..RA capacitor contactor series.
- 3 normally open main poles.
- 0 NO + 0 NC built-in auxiliary contacts.
- 200 V AC 50 Hz / 200–220 V AC 60 Hz control coil.
- Special front-mounted block with 3 damping resistors.
- Capacitor precharging helps limit switching current peaks.
- Designed for capacitor switching where peak currents can exceed 100 times nominal RMS current.
- Electrical durability of up to 250,000 operating cycles at operational voltages below 500 V.
- Main circuit rated operational voltage up to 690 V AC.
- Screw terminal connections for industrial wiring.
Controlled Capacitor Switching with Integrated Damping Resistors
Capacitor banks can produce extremely high transient currents when energised. The ABB UA50-30-00RA is specifically designed to manage these demanding switching conditions using a front-mounted resistor block that serially inserts three damping resistors into the circuit. This arrangement limits the initial current peak and precharges the capacitors before the main poles complete the connection.
The UA..RA design is particularly suitable for power factor correction systems where capacitor stages are switched repeatedly in response to changing electrical loads. The integrated resistor arrangement allows the contactor to handle very high peak currents without requiring additional inductances, providing a compact solution for industrial capacitor bank control.
Typical Applications
- Automatic power factor correction panels.
- Three-phase capacitor bank switching.
- Reactive power compensation systems.
- Industrial electrical distribution equipment.
- Manufacturing and process plant power factor correction.
- Capacitor switching applications with very high energisation currents.
Technical Specifications
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| Terminal Type | Screw | |
|---|---|---|
| Series | UA50..RA | |
| ABB order code | 1SBL351024R7500 | |
| EAN | 3471522303752 | |
| Product type | Capacitor switching contactor with damping resistors | |
| Control supply voltage at 50 Hz | 200 V AC | |
| Control supply voltage at 60 Hz | 200–220 V AC | |
| Number of main poles | 3 | |
| Main contacts | 3 NO | |
| Built-in auxiliary contacts | 0 NO + 0 NC | |
| Damping resistors | 3 integrated resistors | |
| Main circuit rated operational voltage | up to 690 V AC | |
| Electrical durability at Ue < 500 V | 250,000 operating cycles | |
| Electrical durability at 500 V ≤ Ue ≤ 690 V | 100,000 operating cycles | |
| Maximum capacitor residual voltage before re-energisation | ≤50 V | |
| Coil type | AC operated with laminated magnet circuit | |
| Terminal type | Screw terminals | |
| Coil terminal protection | IP20 | |
| Dimensions (W × H × D) | approx. 70 × 150 × 140.4 mm | |
| Weight | approx. 1.35 kg | |
| Product group | 311503 – Contactors A Small (Frctl) |
Frequently Asked Questions
What is the ABB UA50-30-00RA used for?
The ABB UA50-30-00RA is a 3-pole capacitor switching contactor designed for capacitor banks used in power factor correction and reactive power compensation systems.
What control voltage does the UA50-30-00RA 1SBL351024R7500 require?
This version uses a 200 V AC control supply at 50 Hz or a 200–220 V AC control supply at 60 Hz.
Why does the UA50-30-00RA have damping resistors?
The contactor incorporates three damping resistors to limit the high current peak that occurs when a capacitor bank is energised. The circuit also precharges the capacitors before the main poles close, helping reduce subsequent switching current peaks.
How many main poles does the ABB UA50-30-00RA have?
The UA50-30-00RA has three normally open main poles for switching three-phase capacitor banks.
Does the UA50-30-00RA require additional inductances for capacitor switching?
No. The UA50-30-00RA is supplied with its integrated damping resistors and is designed to be used without additional inductances for its specified capacitor switching applications.
Trusted ABB Capacitor Switching Technology
ABB UA..RA contactors combine dedicated capacitor-switching construction with integrated damping resistors and capacitor precharging to provide dependable control of high-inrush capacitor banks in industrial power factor correction systems.
