Frako Capacitor Switching Contactors
Advanced Technology Contactors extend both Contactor and Capacitor life!
FRAKO Capacitor Switching Contactors are specifically designed for capacitor switching to achieve reliability and long life expectancy for your capacitor system.
FRAKO Contactors are available with or without pre-charge resistors. Frako Contactor Brochure
Contactors with pre-charge resistors (K3-…K… type)
Contactor with Pre-charge Resistors
Modern capacitor systems use special contactors that are equipped with resistors to suppress the switching currents. The resistors are switched in series with the capacitor prior to the closing of the main contacts and removed from the circuit after energization, so as not to cause additional power losses.
This feature is referred to as leading transition contact with pre-charge (or pre-insertion) resistor and offers these advantages:
- Significant damping of inrush current
- Suppression of voltage transients during switching
- Protection for both capacitor and contactor
- Extended capacitor and contactor life
- May be used with and without series reactors
- Increased system reliability
| Part No. | Max AMP Rating at 50°C |
208 V | 240 V | 480 V | 600 V |
|
Select by Kvar (range) |
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| K3-18NK10-110 | 0-18 | 0-6 | 0-7 | 0-15 | 0-18 |
| K3-24K00-110 | 14-28 | 4.5-10 | 5.5-11 | 11.5-25 | 14.5-30 |
| K3-32K00-110 | 14-36 | 4.5-12.5 | 5.5-15 | 11.5-30 | 14.5-35 |
| K3-50K00-110 | 30-48 | 10-16.7 | 12.5-20 | 25-40 | 31-50 |
| K3-62K00-110 | 30-72 | 10-25 | 12.5-30 | 25-60 | 31-75 |
| K3-74K00-110 | 30-108 | 10-32 | 12.5-36 | 25-72 | 31-90 |
| K3-90K00-110 | 50-115 | 17-40 | 20-47 | 40-95 | 50-120 |
| K3-115K00-110 | 50-144 | 17-46 | 20-56 | 40-114 | 50-143 |
Contactors without pre-charge resistors (K3-…A… type)
Contactor without Pre-charge Resistors
Capacitors with series reactors (for tuning or detuning) have lower peak inrush current than systems that do not include reactors. For these applications, FRAKO offers contactors with special wear-resistant contact material which enables them to switch the reactor/capacitor network without the need for pre-charge resistors. These special contactors offer several advantages for capacitor switching applications that include series-connected reactors: Safe switching (ON and OFF) of reactor/capacitor steps
- Improved voltage quality made possible through chatter-proof switching operations
- Extended capacitor life
- Extended contactor life (>100,000 switching operations)
- Increased system reliability
Call us 1-262-618-2403, Email or visit our Contact us page for Application Engineering or Quotes for Capacitor Switching Contactors.
Maximum Current (continuous): |
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| K3-..K Contactors (with resistors) |
K3-18NK | K3-24K | K3-32K | K3-50K | K3-62K | K3-74K | K3-90K | K3-115K |
| Amps in 50°C ambient | 0-18 | 14-28 | 14-36 | 30-48 | 30-72 | 30-108 | 50-115 | 50-144 |
| Amps in 60°C ambient | 0-18 | 14-28 | 14-36 | 30-48 | 30-72 | 30-87 | 50-108 | 50-130 |
| K3-..A Contactors (w/o resistors) |
K3-18ND | K3-24A | K3-32A | K3-50A | K3-62A | K3-74A | K3-90A | K3-115A |
| Amps in 50°C ambient | 18 | 28 | 36 | 48 | 32 | 108 | 115 | 144 |
| Amps in 60°C ambient | 18 | 28 | 36 | 48 | 72 | 87 | 108 | 130 |
General Specification: |
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| Parameter | K3-18 | K3-24 | K3-32 | K3-50 | K3-62 | K3-74 | K3-90 | K3-115 |
| Maximum Voltage | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V |
| Switching Time (msec) | 8-16 | 10-25 | 10-25 | 12-28 | 12-28 | 12-28 | 20-35 | 20-35 |
| Typical RK5 Fuse (A) | 50 | 90 | 125 | 200 | 250 | 300 | 300 | 300 |
| Typical T Fuse (A) | 70 | 110 | 150 | 175 | 175 | 175 | 300 | 300 |
| Power Loss (Watts) | 3.5 W | 4.7 W | 5.3 W | 9.2 W | 10.9 W | 12.5 W | 9.3 W | 11.0 W |
| Terminal capacity Flexible (awg) | 2x(18-10) | 1x(14-4) | 1x(14-4) | 1x (10-0) | 1x (18-3/0) plus1x (8-4/0) | |||
| Terminal capacity Solid (awg) | 2x(18-10) | 1x(16-10) | 1x(16-10) | 1x(12-10) | 1x(12-10) | 1x(12-10) | Use flexible wires | |
| Coil Voltage range | 85% to 110% of rated coil voltage | |||||||
| Coil Terminals Flexible (awg) | 18-12 | 18-12 | 18-12 | 18-12 | 18-12 | 18-12 | 18-12 | 18-12 |
| Coil Terminals Solid (awg) | 14-12 | 14-12 | 14-12 | 14-12 | 14-12 | 14-12 | 14-12 | 14-12 |
| Weight (kg) | 0.34 | 0.62 | 0.62 | 1.0 | 1.0 | 1.0 | 2.3 | 2.3 |
| UL Approval | File # E 41502 for USA and Canada (UL-508) | |||||||
