84872501,261-971,Crouzet 频率 监控继电器 84872501, 带DP 常开/常闭 触点, 120 → 277 V 交流 ,Crouzet
Monitors the frequency variation of 50 or 60 Hz alternating signals.
Monitors its own supply voltage connected between phase and neutral.
Under and over-frequency with two independent relay outputs.
Measurement in true RMS.
Selectable memory function.
LED status display.
| Operating voltage: | 120 → 277 Vac (-15 % / +10 %) |
| Measuring range: | 40 → 70 Hz |
| High threshold setting: | -2 → +10 Hz |
| Low threshold setting: | +2 → -10 Hz |
| Fixed hysteresis | 0.3 Hz |
| Display accuracy | ± 1 % of full scale |
| Delay at threshold: | 0.1 → 10 sec. (0 + 10 %) |
| Display accuracy: | ±10 % of full scale |
| Output: | 2 single changeover relays |
| Cut-off voltage (max.): | 250 Vac / Vdc |
| Cut-off current (max.): | 5 A AC / DC |
| Enclosure: | 35 mm |
| Operating temperature: | -20 °C → +50 °C |
| Approvals | UL; CSA; GL; GOST; applicable WEEE |
