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Self-protecting PTC element (aluminum housing) with very high operating voltage limit; protection class IP20.
Contact
Michael Koch GmbH
Phone: +49 7251 96 26-200
| Parameter | Symbol | Value | Unit | Conditions |
|---|---|---|---|---|
| Tolerance (resistance) | ± 35 | % | Caution: Typical for thermistors and not reducable | |
| Max. perm. operating voltage | UB | ≤ 600 AC | V | according to CSA |
| UB | ≤ 848 DC | V | ||
| Threshold limit voltage DC | UBD | 1300 (1750 Ohm) | V | Caution: Abruptly low resistance (reaction like a short circuit) |
| UBD | 1100 (350 Ohm) | V | ||
| UBD | 900 (175 Ohm) | V | ||
| Isolation voltage1 | UISO | ≥ 4,000 AC | V | f = 50 Hz; t = 1 s |
| Surface temperature at constant load with UN | To | 175 ± 10K | °C | The temperature will stay within the tolerance at a constant load of 500VAC |
| Transiston temperature | CP | 140 | °C | Depending form the material, describes the temperature at which the resistance reaches two times the rate of its lowest value |
| Cold resistance at 25°C | R25 | 44, 88, 437, 5 | Ω | Caution: Dynamic value, depending on the temperature of the PTC! (cf. the characteristic curve of R(T)) and the applied voltage! |
| Energy consumption | E | 2160 | J (Ws) | at 1.2s (1% duty cycle) |
| Pulse rating | Pi | ≤ 20 | kW | Value in Approximation |
| Storage temperature | ϑs | -25 … +85 | °C | |
| Certifications | cCSAus | acc. to Standard CSA-C22.2 and UL508 | ||
| Rated power | P | 40 | W | unobstructed convection |
| P | 140 | W | on heat sink (70 °C) | |
| Dimensions | L | 167,0 | mm | |
| B | 34,0 | mm | ||
| H | 10,7 | mm |
Dimensions and mounting holes (mm)
Video about the safe BWD braking resistors from Michael Koch GmbH:
