How to Size a Contactor for Capacitor Bank Switching: Complete Engineering Guide
Size AC-6b contactors for capacitor bank switching correctly: avoid weld failures with proven IEC 60947-4-1 sizing methods and kvar checks. Shop at Stoklink.
The Schneider Electric BLRCH571A000B44 is a VarPlus Can HDuty power factor correction capacitor rated 57.1 kvar at 440 V, 50 Hz. Its heavy-duty dielectric tolerates network harmonic content up to 20 % and a continuous overcurrent capacity of 1.8 x In, so it keeps correcting power factor on busbars that also feed variable-speed drives, rectifiers and other harmonic-generating loads without overheating.
At 57.1 kvar and 440 V, the BLRCH571A000B44 is sized for incomers or filter branches with documented harmonic distortion up to 20% - its 1.8 x In continuous overcurrent capacity and 250 x In inrush rating are built in for duty where variable-speed drives or rectifiers already share the busbar. Pick a smaller HDuty step in the same 440 V family when correcting a lighter non-linear load, or a larger one as the reactive power demand grows. On network segments that stay under 10% harmonic content, the standard-duty EasyLogic range covers the same kvar steps at a lower continuous overcurrent rating.
| Range | PowerLogic |
|---|---|
| Range of product | PowerLogic |
| Product or component type | Heavy duty capacitor |
| Product name | PowerLogic PFC Capacitor |
| Network frequency | 50/60 Hz |
| Series name | HDuty |
| Network harmonic content | <= 20 % |
| Electrical parameters | 57.1 kvar 50 Hz |
| Maximum permissible voltage | 1.1 x Un (8 hours over 24 hours) |
| continuous overcurrent capacity | 1.8 x In |
| Rated voltage | 440 V AC 50/60 Hz |
| Dielectric losses | < 0.2 W/kvar |
|---|---|
| Power losses | < 0.5 W/kVAr |
| Capacitance tolerance | - 5 % to 10 % |
| Voltage test | 2.15 x Un AC between terminals for 10 s, <= 660 V - 3 kV AC between terminal and container for 10 s, >= 660 V - 6 kV AC between terminal and container for 10 s |
| Inrush current | 250 x In |
| Maximum switching operation per year | 7000 |
| Service life in hours | 130000 h |
| Dielectric material | Metallized polypropylene film with Zn/Al alloy, special resistivity & profile, special edge (wave cut) |
| Impregnation material | Non-PCB dry PUR resin, Biodegradable |
| Type of installation | Indoor installation |
| Connections - terminals | Stud terminals |
| Mounting mode | Upright/horizontal |
| Diameter | 136 mm |
| Height | 321 mm |
| Net weight | 5.3 kg |
| Standards | IEC 60831-2, IEC 60831-1 |
|---|---|
| IP degree of protection | IP00 |
| Operating altitude | 2000 m |
| Temperature class | D |
| Ambient air temperature for operation | -25…55 °C |
| Relative humidity | 95 % |
| Part number | BLRCH571A000B44 |
|---|---|
| Brand | Schneider Electric |
| Condition | New, factory sealed |
| Source | Schneider Electric and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| Warranty (in months) | 18 |
|---|
| Unit Type of Package 1 | PCE |
|---|---|
| Number of Units in Package 1 | 1 |
| Package 1 Height | 18.000 cm |
| Package 1 Width | 18.000 cm |
| Package 1 Length | 39.500 cm |
| Package 1 Weight | 5.252 kg |
| Unit Type of Package 2 | S06 |
| Number of Units in Package 2 | 12 |
| Package 2 Height | 75.000 cm |
| Package 2 Width | 60.000 cm |
| Package 2 Length | 80.000 cm |
| Package 2 Weight | 75.024 kg |
| Shipping weight | 5.3 kg |
| Ships from | Türkiye |
| Dispatch | — |
| Stock | On request |
Source: manufacturer data · Last verified: 30 Oct 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated operational voltage of BLRCH571A000B44 is 440 V AC.
The tariff (HS) code on file for BLRCH571A000B44 is 853210.
BLRCH571A000B44 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival.
Size AC-6b contactors for capacitor bank switching correctly: avoid weld failures with proven IEC 60947-4-1 sizing methods and kvar checks. Shop at Stoklink.