Resistors for Telecom & Data Center
Telecom central offices and hyperscale data centers consume 1–100 MW per site and rely on resistors throughout the power chain. Rotary-UPS and battery-UPS systems (200 kVA–2 MVA) use pre-charge resistors (10–50 Ω, 500–2000 W) to limit DC-link inrush, and dynamic-braking resistors to dissipate regenerative energy. 5G base-station rectifiers operate on -48 V DC plant per ETSI EN 300 132-2, with 25 mΩ–10 mΩ shunt resistors monitoring battery-string current at ±0.25 % accuracy. Server-rack DC-DC converters require AEC-Q200-equivalent current-sense and snubber resistors operating at 105 °C ambient. Surge-protection resistors paired with GDTs and TVS clamp lightning per ITU-T K.20 (10 kA 8/20 µs) at the BTS antenna interface. All telecom resistors must pass GR-1089 Issue 7 NEBS Level 3 fire / safety testing.
Key Requirements
- NEBS Level 3 (Telcordia GR-63-CORE / GR-1089-CORE) fire and safety compliance
- ETSI EN 300 132-2 / -3 compatibility for -48 V DC and 400 V DC central-office power
- Surge withstand 10 kA 8/20 µs per ITU-T K.20 at antenna and copper-port interfaces
- Shunt resistors with ±0.25 % tolerance, 15 ppm/°C TCR for battery-string monitoring
- Continuous operation at 105 °C ambient inside sealed outdoor cabinets and IT racks
- MTBF ≥ 1 × 10⁹ hours per Telcordia SR-332 for 20-year service life
How to Select
- Match resistor IP rating to cabinet class — IP55 outdoor, IP20 server rack, IP31 telecom shelf
- For -48 V DC plant, specify low-EMI non-inductive wirewound or thick-film to meet ITU-T K.48
- Size pre-charge τ = R × C so 5τ < 500 ms UPS contactor closure (typical 200 kVA UPS)
- Verify flammability per UL 94 V-0 for in-cabinet placement near battery cells
- Request NEBS Level 3 fire-spread test report and earthquake zone 4 shock data
- Use four-terminal Kelvin shunts for currents > 50 A to eliminate trace-resistance error
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Frequently asked questions
Are your power resistors NEBS Level 3 compliant for telecom installation?
What shunt resistor accuracy is required for monitoring a 48 V battery string?
Do you supply 48 V DC pre-charge resistors for a 1 MW data-center UPS?
How do you handle surge protection at a 5G base station antenna feed?
Sample Request
Standard samples are provided free of charge in reasonable quantities (shipped within 2–3 business days). Custom samples are delivered within 2–4 weeks. Please use the form on the right to tell us:
- Company and contact details
- Target part number or key specs (power / resistance / package)
- Application scenario and estimated annual volume
- Shipping address and expected delivery date