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, 3 pole, and has an operating voltage of 480Y/277 VAC. It also provides a 100 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 a shunt trip. This breaker was calibrated for 40 degrees C. This product is UL Listed as High Intensity Discharge. HACR rated.