Siemens ED43B090L Circuit Breaker 3-pole 480V 90A

Product Description

The SIEMENS ED43B090L is a 3-pole molded case circuit breaker rated for 480 volts and 90 amps, built on the ED4 frame platform. It provides overcurrent and short-circuit protection for three-phase electrical distribution systems in commercial and industrial applications. Licensed electricians install this breaker in panelboards, switchboards, and motor control centers where reliable branch circuit protection is required. The ED4 frame design offers a compact footprint while handling the thermal and magnetic trip demands of heavy commercial loads. This breaker is a core component in 480-volt three-phase distribution infrastructure.

The ED43B090L is suited for commercial and light industrial electrical systems operating on 480-volt three-phase service. Typical applications include feeder and branch circuit protection for HVAC equipment, motors, and general power distribution loads. It fits installations where a 90-amp, 3-pole breaker is required to comply with NEC branch circuit and feeder protection requirements. Electricians working on commercial tenant build-outs, mechanical room panels, and equipment disconnects commonly specify this breaker for its ED4 frame compatibility.

Key Features

• 3-pole configuration for three-phase 480-volt circuit protection
• 90-amp continuous current rating for heavy commercial and light industrial loads
• ED4 frame molded case construction for panelboard and switchboard applications
• Thermal-magnetic trip mechanism provides overcurrent and short-circuit protection
• Compact molded case profile supports high-density panel layouts

Compatibility

Designed as an OEM-style replacement or new-install breaker for electrical panelboards and switchboards accepting ED4 frame, 3-pole, 480-volt molded case circuit breakers.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize and lock out the panel or switchboard before installing or replacing this breaker. Verify that the bus and enclosure are rated for the ED4 frame and that the panel's available fault current does not exceed the breaker's interrupting rating. Do not exceed the breaker's 90-amp continuous rating when sizing conductors and loads.

Technical Specifications

• Poles: 3
• Voltage Rating: 480 volts
• Amperage Rating: 90 amps
• Frame: ED4
• Dimensions (L x W x H): 19.9 inches x 15.2 inches x 6.4 inches
• Weight: 3.84 pounds
• UPC: 78364323622

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: ED43B090L