The 5SY8104-7 is a 1-pole SENTRON miniature circuit breaker with a C tripping characteristic, rated for 400 V AC (50/60 Hz) and 60 V DC. On the DC side, it's rated 15 kA at 60 V DC, which covers most control-circuit and battery-bank applications. The UL 1077 listing at 5 kA confirms it's recognized as a supplementary protector in North American panels, not a branch-circuit rated breaker.
The operating temperature range is -40 °C to 75 °C, with humidity derating above 55 °C (95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C). That's wide enough for unheated outdoor cabinets in cold climates, but watch the humidity curve if the panel sees condensation.
Mechanical endurance and compliance
Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. Halogen-free and silicon-free construction, which matters for clean-room or semiconductor-adjacent installations where outgassing contaminates optics or wafers. Sealable terminals are standard, allowing lockout/tagout compliance without add-on accessories.