RCB inmunized S24
S24 super-immunised RCDs: S24 Class A+SI protection for disturbed circuits and sensitive electronic loads.
- Immunity: designed to reduce nuisance tripping.
- Class: Class A+SI for electronic loads.
- Series: S24 modular format for DIN boards.
- Use: LED, drives, IT equipment and sensitive circuits.
S24 high-immunity RCDs: Type A and service continuity
Solera S24 high-immunity RCDs are Type A devices with increased immunity to disturbances, identified as A+SI. They are considered for boards with electronic loads where certain transients can cause unwanted tripping. Published references are two-pole devices rated 25, 40 and 63 A, with 30 mA sensitivity.
Published S24DSI references
| Reference | Commercial designation | Rated current | Sensitivity |
|---|---|---|---|
| S24DSI2P2530 | 2P | 25 A | 30 mA |
| S24DSI2P4030 | 2P | 40 A | 30 mA |
| S24DSI2P6330 | 2P | 63 A | 30 mA |
When to consider increased immunity
For electronic lighting, IT equipment or devices with filters, first establish whether tripping results from genuine leakage or a disturbance. Increased immunity does not repair faulty insulation or allow leakage currents to be ignored. It does not replace Type B where the system requires smooth DC detection.
For example, S24DSI2P4030 is rated 40 A, 30 mA and 230 V AC and occupies two modules. Its specification states instantaneous operation without delay: high immunity does not mean selective Type S. Check terminals, neutral arrangement, connections and overcurrent protection before replacing another RCD.
Frequently asked questions
Does a high-immunity RCD prevent all tripping?
No. It is designed to reduce unwanted tripping associated with certain disturbances while retaining residual current protection. Genuine leakage or a fault must still be investigated and corrected.
Does A+SI detect smooth DC like Type B?
Do not assume this. S24DSI references are identified as high-immunity Type A. Where smooth DC components may occur, check the detection type required by the equipment and installation.
Does S24DSI2P4030 reconnect automatically or provide a selective delay?
Automatic reconnection is not declared for this reference, and its specification states instantaneous operation. Automatic resetting and selectivity are separate characteristics that must be explicitly checked.