The Siemens 5SY6004-7 is a SENTRON miniature circuit breaker (MCB) in the compact 1-module-width (18 mm) form factor, with a C-curve tripping characteristic rated at 4 A and a 6 kA breaking capacity per EN 60898. The C-curve means the magnetic trip activates at 5–10× rated current (20–40 A for this 4 A unit), which suits lighting, socket outlets, and small transformer circuits.
Rated current is 4 A at 30 °C ambient, derating to 3.84 A at 40 °C and 3.76 A at 45 °C. If your panel runs warm (e.g., enclosed or adjacent to heat sources), the effective continuous load limit drops — size the branch circuit accordingly. For installations with higher available fault current (e.g., near a large transformer), you would need a higher-rated breaker or a current-limiting upstream device. The 1+N-pole design switches both phase and neutral, with the neutral pole switching but not protecting (no overcurrent trip on neutral). This is standard for single-phase final circuits where disconnecting the neutral is required for safety during maintenance. Rated insulation voltage is 250 V AC, and the overvoltage category is III (distribution level). Pollution degree 2 means it is suitable for normal indoor environments with only non-conductive pollution.
Snap-on mounting to standard DIN rail (35 mm). Width is 18 mm (1 modular unit), depth 76 mm, height 90 mm. Installation depth (the space needed behind the panel door) is 70 mm. Touch protection is integrated per the product features.
The MCB is halogen-free and silicon-free, meeting material restrictions for sensitive environments like data centers or medical facilities. Vibration resistance per IEC 60068-2-6 is verified. The product designation per IEC 81346-2 is F (protective device). Energy limitation class 3 indicates the breaker limits let-through energy to a low level, reducing stress on downstream equipment during a fault.