Excellent PLC
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| Mobile | +8613666033393 | |||||||
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| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Product Introduction
The ABB UA50-30-00RA 1SBL351024R8000 Capacitor Contactor is a high-performance electrical contactor designed specifically for switching and controlling power capacitor banks in reactive power compensation systems. It provides reliable operation under heavy inrush currents generated during capacitor energization.
This model integrates damping resistors that minimize inrush currents, ensuring longer capacitor life and system stability. It is widely used in low-voltage reactive power compensation panels, harmonic-sensitive environments, and industrial distribution networks requiring high efficiency and reduced losses.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Name | Capacitor Contactor |
| Model Number | UA50-30-00RA (1SBL351024R8000) |
| Switching Category | AC-6b (capacitor switching) |
| Power Range (at 400V) | Up to 25 kvar |
| Mechanical Endurance | >10 million operations |
| Electrical Endurance | >200,000 operations at rated load |
| Standards Compliance | IEC 60947-4-1, IEC 60831 |
| Protection Class | IP20 (with cover) |
| Mounting Type | DIN rail or screw mounting |
| Operating Temperature | –25 °C to +55 °C |
| Dimensions | 70 x 140.4 x 150 mm |
| Weight | 1.35 kg |
Product Applications
The ABB UA50-30-00RA capacitor contactor is widely applied in:
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Reactive Power Compensation Panels – Ensures automatic capacitor switching in LV distribution systems.
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Industrial Plants – Reduces power losses and improves efficiency of motors, transformers, and large equipment.
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Commercial Buildings – Provides stable power factor correction to reduce utility penalties.
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Harmonic-Prone Systems – Operates reliably in networks where capacitors are exposed to harmonic currents.
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Energy-Saving Projects – Contributes to optimized energy use by maintaining power factor close to unity.
Product Advantages
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Optimized for Capacitors – Built with damping resistors to suppress inrush currents effectively.
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Long Service Life – Designed for high mechanical and electrical endurance.
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Compact Design – Suitable for panel assembly with reduced space requirements.
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High Reliability – Maintains stable switching even under harmonic distortion.
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Easy Integration – Compatible with ABB control circuits and automation systems.
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Energy Efficiency – Helps reduce power losses and avoids power factor penalties.
FAQ
Q1: What is the switching category of UA50-30-00RA?
A1: It belongs to AC-6b, which is dedicated to capacitor switching applications.
Q2: How does the built-in resistor help in capacitor switching?
A2: The resistor limits the inrush current during energization, reducing stress on capacitors and extending their service life.
Q3: Can this contactor be used for motor switching?
A3: No, it is specifically designed for capacitor banks; motor switching requires AC-3 or AC-4 category contactors.
Q4: What auxiliary contacts are included?
A4: The contactor includes one auxiliary contact (normally open), with options to add auxiliary blocks.
Q5: Is it compatible with automatic power factor controllers?
A5: Yes, it is fully compatible and can be controlled by ABB or third-party PFC relays.
Q6: What is the maximum capacitor rating at 400V?
A6: It supports up to 25 kvar capacitor banks.
Q7: How does it perform in environments with harmonics?
A7: The design tolerates harmonic conditions, but filtering may be required in highly distorted systems.
Q8: What is the coil voltage range?
A8: 220–240 V AC, 50/60 Hz, with other coil voltage variants available on request.
Q9: Does it require additional surge protection?
A9: The integrated resistor provides damping, but in severe cases, external surge suppressors are recommended.
Q10: Can it be mounted on DIN rails?
A10: Yes, it can be mounted both on DIN rails and directly with screws.
Recommended Models
| Model Number | Current (AC-6b) | Voltage Rating | Capacitor Power at 400V | Coil Voltage |
|---|---|---|---|---|
| UA16-30-00RA | 16 A | 690 V | 7.5 kvar | 220–240 V AC |
| UA26-30-00RA | 26 A | 690 V | 12.5 kvar | 220–240 V AC |
| UA40-30-00RA | 40 A | 690 V | 20 kvar | 220–240 V AC |
| UA50-30-00RA | 50 A | 690 V | 25 kvar | 220–240 V AC |
| UA63-30-00RA | 63 A | 690 V | 30 kvar | 220–240 V AC |
| UA75-30-00RA | 75 A | 690 V | 37.5 kvar | 220–240 V AC |
Popular ABB Models
| Model Number | Product Type | Rated Current/Power | Voltage | Application |
|---|---|---|---|---|
| A9-30-10 | Control Contactor | 9 A | 690 V | Motor control |
| AF26-30-00 | Motor Contactor | 26 A | 690 V | Motor starter circuits |
| AF40-30-00 | Motor Contactor | 40 A | 690 V | Motor starter panels |
| AF116-30-00 | Motor Contactor | 116 A | 690 V | Heavy motor loads |
| AF145-30-00 | Motor Contactor | 145 A | 690 V | Large industrial drives |
| B7-30-10 | Mini Contactor | 7 A | 690 V | Control circuits |
| AF265-30-00 | Motor Contactor | 265 A | 690 V | Industrial applications |
| AF370-30-11 | Motor Contactor | 370 A | 690 V | High-power equipment |
