What it is and what it does
The Siemens 3VA1132-4GE46-0AA0 is a SENTRON molded case circuit breaker (MCCB) with four poles, rated at 32 A continuous (Iu). It uses a TM220 thermal-magnetic release — the thermal element handles overloads, the magnetic element clears short circuits. The interrupting ratings climb to 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault-current panels without cascading upstream.
Ratings that decide the fit
The 32 A rating holds steady from 45 °C to 50 °C; at 70 °C it derates to 30 A. That means in a warm panel — say, near a drive cabinet — you still get 30 A continuous without nuisance tripping. The magnetic short-circuit release is adjustable up to 320 A (li max), which lets you tune the instantaneous trip for motor inrush or transformer magnetizing current. The interrupting ratings drop as voltage rises: 52.5 kA at 440 V, 11.9 kA at 500 V and at 690 V. That 11.9 kA at 690 V is the number to check if this breaker feeds a 690 V drive bus — it's still a solid figure, but it's not the headline 121 kA. The isolation voltage (Ui) is 800 V, so the breaker is rated for 690 V systems.
Mounting and integration
The 3VA1132-4GE46-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. It mounts on a DIN rail or directly to a backplate via the screw terminals. The front face carries an IP40 rating — fine for a closed panel, but not for washdown areas. The N-conductor protection is rated at 100 %, meaning the neutral pole is fully rated, not just a switched neutral.