Our resistance box solutions are engineered for precise speed control and reliable performance in EOT cranes and heavy-duty industrial applications. Built with stainless steel and high-grade components, each box resistor ensures excellent heat dissipation, low maintenance, and long-lasting durability.
We offer a wide range of options including decade box, decade resistance box, decade box resistor, and variable resistance box, all designed to meet diverse operational requirements. For demanding environments, we also provide water proof switch box solutions that guarantee safety and performance in harsh conditions.
These resistance systems play a critical role in motor starting, braking, and regulation while complying with international safety standards. Available in customizable designs, our resistance boxes are trusted across industries for efficiency, precision, and dependable operation.
Stainless Steel Punched Grid Resistors
Resistors are designed to meet requirements of both A.C. & DC applications. The basic types of resistors are stainless Steel and Punched Steel Resistors these are manufacture for current ratings from 10 to 800 Amps. Continuous resistors of higher ratings are manufactured using 2 or more parallel paths. Resistors with short time rating up to 3000 Amps or even more for neutral earthing are possible which suitable for system voltage up to 11 kv and above.
Technical Specification
| Enclosure | – sheet Steel Duty hot Dip Galvanized/painted |
| Mounting Protection degree | – IP-11/ IP-21/IP-23/IP-33 |
| Current rating (s.s. grid) continuous | – 7-400 Amps |
| Current rating (p.s. grid) continuous | – 7-800 Amps |
| Cooling | – Air/oil cooled |
| Temperature rise | – 2250C/2500C/3750C |
| Cable entry | – Bottom |
| Series Connection | – Punched grid elements are tig weided |
| RATED VALUE (Ohms) | Grid Type | Current rating for various duty factors (Amps) | |||
|---|---|---|---|---|---|
| 25% ED | 40% ED | 60% ED | 100% ED | ||
| 0.010 | Ps10 | 390 | 325 | 280 | 234 |
| 0.022 | PS22 | 265 | 220 | 190 | 158 |
| 0.032 | PS32 | 220 | 182 | 153 | 131 |
| 0.046 | PS46 | 185 | 151 | 130 | 110 |
| 0.068 | PS68 | 152 | 126 | 110 | 90 |
| 0.100 | PS100 | 125 | 103 | 88 | 74 |
| 0.150 | PS150 | 101 | 84 | 72 | 61 |
| 0.220 | PS220 | 83 | 70 | 59 | 50 |
| 0.300 | PS300 | 82 | 59 | 50 | 43 |
| 0.460 | PS460 | 58 | 48 | 40 | 35 |
| 0.720 | PS720 | 47 | 39 | 33 | 28 |
| 1.000 | PS1000 | 40 | 33 | 28 | 24 |
| 1.500 | PS1500 | 32 | 27 | 23 | 19 |
| 2.500 | PS2500 | 25 | 21 | 18 | 15 |
| 4.500 | PS4500 | 15 | 13 | 11 | 8 |
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Faqs
Frequency Asked Questions
What is a resistance box and why is it used in cranes?
A resistance box is an electrical device used in EOT cranes and industrial machinery to control motor speed, regulate braking, and ensure smooth operation. It helps prevent sudden jerks, reduces wear on motors, and enhances safety during crane operations.
What types of resistance boxes do you manufacture?
How does a decade resistance box work?
What is the difference between a decade box and a variable resistance box?
Are your resistance boxes suitable for heavy-duty crane applications?
What materials are used in your resistance box solutions?
Do you provide waterproof resistance boxes?
What are the benefits of your resistance box systems?
Can resistance boxes be customized for different applications?
Which industries use your resistance box solutions?
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