Why this FAQ?
These FAQs summarize the ABB UA50-30-00RA contactor’s key ratings, durability, standards, and installation guidelines, helping engineers and panel builders make safe and informed choices.
What is the ABB UA50-30-00RA contactor designed for?
The ABB UA50-30-00RA is a 3-pole block type contactor designed for capacitor switching applications. It includes built-in damping resistors to limit inrush current and ensure safe capacitor precharging. It must always be used without additional inductances.
What are the coil voltage ratings for the UA50-30-00RA?
The control circuit operates at 220–230 V AC at 50 Hz or 230–240 V AC at 60 Hz. Coil consumption is approximately 180–210 VA at pull-in and 18 VA during holding.
What are the rated operational powers for capacitor switching?
At 400/415 V, the contactor handles up to 40 kvar at 40 °C, 40 kvar at 55 °C, and 35 kvar at 70 °C. At 440 V, it supports 50 kvar (40 °C), 43 kvar (55 °C), and 37 kvar (70 °C). At 500/550 V, it reaches 55 kvar at 40 °C. Refer to datasheet for full voltage/kvar combinations.
What is the electrical durability of this contactor?
The UA50-30-00RA achieves up to 250,000 operating cycles for Ue ≤ 440 V. For 500–690 V, durability is 100,000 cycles. Maximum electrical switching frequency is 240 operations per hour.
Which standards and certifications does the UA50-30-00RA comply with?
This contactor complies with IEC/EN 60947-1 and IEC/EN 60947-4-1. Rated insulation voltage is 1000 V (IEC) and 600 V (UL/CSA). Impulse withstand voltage is 8 kV.
What are the mounting and wiring options?
It can be mounted on DIN rails TH35-15 or TH75-25 per IEC 60715, or fixed using two diagonal M6 screws. Main circuit wiring supports 6–16 mm² rigid or 6–10 mm² flexible cables, while auxiliary wiring accepts 0.75–2.5 mm² flexible or 1–4 mm² rigid conductors.
What protection and safety features are included?
The coil terminals have IP20 protection, while main terminals are rated IP10 per IEC 60529. Capacitors must be discharged to ≤ 50 V before re-energization to ensure safe switching. Recommended short-circuit protection is gG type fuses, up to 200 A.
Where can I buy the ABB UA50-30-00RA in India?
Shansen Enterprises is an authorized ABB channel partner, offering supply across Tamil Nadu and pan-India delivery. Quick WhatsApp-based quotes and technical guidance are available.
