Siemens 3VA4120-4ED34-0AA0 Molded Case Circuit Breaker

Select this 20A molded case circuit breaker when the circuit design calls for that current rating. Coordinate the selection with the load requirements and conductor ampacity.

Its interrupting rating is 14kAIC at 600Y/347VAC and 25kAIC at 480Y/277VAC. Compare available fault current at the installation point with the interrupting rating for the system voltage, and select a rating that meets or exceeds it.

Both the thermal and magnetic trip settings are fixed. The LI thermal-magnetic trip provides time-delayed overload protection and instantaneous short-circuit protection, so select it where fixed trip settings meet the protection requirements.

The load-side lug connection accepts 14-8 AWG copper or 12-8 AWG aluminum conductors. Select the wire size within the range for its conductor material, while also meeting the circuit's ampacity requirements.

The breaker is 5.1 in high, 3.0 in wide and 3.0 in deep. Use these dimensions when planning enclosure layout and space for conductor routing.

The operating temperature range is -25C to 70C. Check the expected temperature at the breaker location against this range when selecting the installation environment.

The breaker carries CE, CSA and UL approvals, with standards CSA C22.2 No. 5, IEC 60947-2 and UL 489. These address circuit-breaker safety and performance requirements; use them when reviewing the project's required approvals and standards.

The 600Y/347VAC slash rating applies to grounded-wye AC systems. Check both phase-to-phase and phase-to-ground voltage when selecting the breaker.

This breaker has 3 poles and a phase count of 3. Check both the circuit's phase count and the number of conductors requiring overcurrent protection when selecting the breaker.