Siemens differential lock 3P 40A 30mA AC type 3 modules for 5SY 5SM23320
Differential lock (circuit breaker) Siemens, with the following characteristics:
- 3 modules
- DIN connection (universal for any switchboard on the market)
- 3 poles
- 40 amperes
- Differential current Idn 30mA
- Voltage 400 Vac
- AC differential type
Compatible with Siemens 5SY series circuit breakers

Siemens differential lock 3P 40A 30mA AC type 3 modules for 5SY 5SM23320
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The differential blocks are mechanically designed to prevent a wrong coupling between the block and the circuit breaker: the power of the block must always be equal or greater than that of the circuit breaker. The lateral plastic clamp allows a quicker assembly of the block on the circuit breaker and a push button prevents possible interventions.
It is used to protect human health in case of earth fault (electrical leakage) or phase-to-earth electrocution, thus providing protection also against macro electrical shock, both direct and indirect, on exposed persons.
The AC differential blockworks only with alternating current. Almost all civil installations fall into this typology.
Characteristics:
- Siemens series
- Voltage 400Vac
- Current In 40A
- Differential current Idn 30mA
- AC differential type
- Frequency of use 50 Hz
- 3 modules
- 3 poles
- Degree of protection IP20, for installation in distribution board, with connected conductors
- Installation depth 70 mm
- Type of mounting DIN rail (REG)
- Mounting position as desired
- Net weight 283 gr
Data sheet
- Voltage:
- 230VAC
- Modules:
- 3
- Poles:
- 3P
- RCD Type:
- AC
- Amps:
- 40A
- Circuit Protections:
- Earth Leakage add-on Blocks