Siemens 3VA4190-5ED34-0AA0 Molded Case Circuit Breaker

This 90A breaker uses thermal-magnetic LI protection: thermal operation responds to sustained overloads, and instantaneous magnetic operation responds to short circuits. Both thermal and magnetic settings are fixed, so select it for a circuit that calls for these nonadjustable protection characteristics.

Rated voltages are 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC and 250VDC. Match the rating to both the system voltage and AC or DC operation; the Y ratings apply to the corresponding wye-system voltages.

The interrupting rating is 35kAIC at 480Y/277VAC and 18kAIC at 600Y/347VAC. At the applicable voltage, select the breaker only when available fault current at the installation point does not exceed that interrupting rating.

The load-side lug accepts copper or aluminum conductors from 8 AWG through 3/0 AWG. Choose a conductor within that range while also meeting the circuit's ampacity requirements; terminal capacity alone does not determine conductor sizing.

Yes. Reverse-feed construction permits the incoming supply to connect to the side normally used for the load, giving you flexibility when planning supply routing.

Current-limiting operation restricts fault-current let-through during interruption, reducing the electrical and thermal stress of a short circuit. Use this feature alongside the voltage-specific interrupting rating when evaluating fault protection.

HACR means heating, air-conditioning and refrigeration. The HACR rating supports selecting this breaker for those applications when its current, voltage and interrupting ratings meet the circuit requirements.

The breaker is 5.09 in high, 3.0 in wide and 2.96 in deep. Use these dimensions to plan the space occupied by the breaker, while accounting separately for conductor routing and termination access.

The operating temperature range is -25C to 70C. Evaluate the temperature at the breaker location, including enclosure conditions, when selecting the installation environment.

This molded case circuit breaker carries UL, CSA, CE and NOM approvals, with standards including UL 489, CSA C22.2 No. 5 and IEC 60947-2. Use these credentials when checking the approval and circuit breaker standard requirements for your project.