E-Frame Breaker are Lighting Panelboard Circuit breakers that are proven effective and reliable which provide a wide variety or robust features that are use specifically in Square D NF Panelboards. This range of breaker is ideally designed to offer superior overload and short circuit protection. All E-Frame breakers have a thermal-magnetic trip unit as well as signal indicator that will indicate when a trip has occur. Mounting bolts are used to hold these breakers in place. This E-Frame breaker is 50A, 1 pole, and has a operating voltage of 277 VAC. It also provides a 25 kA max interrupt rating at 120 VAC. This device has a hold current of 630A which is the maximum current the breaker can be held to ensure it will trip and a trip current of 1800A which is the current value when the breaker is guaranteed to trip. Many accessories are available for this breaker. This one includes 30 mA ground protection. This breaker was calibrated for 40 degrees C. This product is UL Listed as High Intensity Discharge. HACR rated.