Square D EDB34020U is a 3-pole molded‑case circuit breaker rated at 20 A for 277/480 VAC service, designed to protect three‑phase circuits in commercial and industrial panels. It uses thermal‑magnetic protection with an 18 kA interrupting capacity at 480 VAC and features bolt‑on mounting for secure panel installation. As part of the EDB series, this unit is commonly used to protect 3‑phase distribution feeders and equipment in electrical enclosures that operate at high voltage, making it suitable for retrofit or new installations in appropriate Square D panels.
