What this 2-pole Z-curve MCB is and where it fits
The Siemens Betagard 5SL4232-0RC is a 2-pole miniature circuit breaker with a Z tripping characteristic, rated 32 A at 415 V AC and 50/60 Hz. The Z curve trips between 2.5 and 5 times rated current, making it the correct choice for semiconductor protection or sensitive electronic loads where standard B or C curves would allow too much through-fault energy. The 10 kA breaking capacity per EN 60898 (also 10 kA per IEC 60947-2) means it safely clears short-circuit faults up to that level in a 415 V AC system without upstream cascading — sized for sub-distribution boards feeding control cabinets or process instrumentation panels.
Temperature derating — the real current rating changes with ambient
The 32 A rating holds at 50 °C ambient. At 30 °C the breaker carries 35.8 A; at 40 °C it carries 34 A; at 45 °C it carries 33 A; at 55 °C it carries 31 A; at 60 °C it carries 29.9 A. That derating curve matters when the breaker sits in a warm enclosure near transformers or drives — the panel designer sizes the load circuit to the derated figure, not the nameplate 32 A. The operating temperature range spans -40 °C to 75 °C, so cold storage or outdoor cabinets are fine.
Mounting and integration — DIN-rail footprint, any position
The 5SL4232-0RC occupies 2 modular width units (36 mm wide) on a standard DIN rail. Depth is 76 mm, installation depth 70 mm. Mounting position is unrestricted — horizontal, vertical, or inverted — which simplifies layout in tight gland-plate areas. IP20 with connected conductors; degree of pollution 3 and overvoltage category III, so it is rated for fixed-installation distribution boards inside an enclosure. Supplementary devices (auxiliary switches, shunt trips, alarm contacts) can be snapped onto the right side without increasing the width.
Compliance and approvals
The breaker carries ratings per EN 60898 and IEC 60947-2, both at 10 kA. It is halogen-free and silicon-free, which matters for clean-room or high-reliability environments where outgassing contaminants must be avoided. Vibration resistance tested to IEC 60068-2-6 at 50 m/s² over 25 to 150 Hz. Sealable design allows lockout/tagout in safety circuits.