The CR2550 series offers a high Maximum voltage rating, low weight, and an excellent operating temperature range. The indicators are encased in a thermoplastic case material and are fitted with a T-13/4 LED to provide visual indication of electrical flow. The indicators are factory calibrated to provide a preset turn-on point. Attached to the transformer is a high efficiency, bi-polar LED that illuminates when the current is above the turn-on point. The indicator is available as standard with 11 inch long leads and a red or green LED indicator.