0603 footprint, 500 mA hold — the board-protection fit
The 0603L050YR: Its 500 mA hold current (Ih) at 25 °C defines the maximum steady-state load the fuse passes without tripping — above that threshold, the polymer heats and the device switches to a high-resistance state, limiting current to protect the downstream circuit. The trip current (It) is 1 A, and the device clears a fault in 100 ms typical at that level, fast enough to protect most low-voltage DC rails from sustained overcurrent.
Voltage and interrupt ceiling — where it fits in the rail
Rated for a maximum voltage of 6 V and a maximum interrupt current of 40 A, this PTC is sized for low-voltage DC power distribution — think USB power rails, battery management outputs, or peripheral port protection where the supply stays under 6 V. The initial resistance (Ri) is 100 mOhms minimum, rising to 680 mOhms maximum after a trip event (R1) — the post-trip resistance ceiling means the circuit sees a higher series impedance after a fault, which may need to be factored into the load's minimum operating voltage.
Active production, cURus and TUV approvals
Carries cURus and TUV agency approvals, confirming compliance with UL 1434 and IEC 60738-1 for polymeric PTC overcurrent protectors — a standard requirement for equipment sold into North American and European markets. Supplied in Tape & Reel (TR) or Cut Tape (CT) packaging, matching standard 8 mm carrier tape for 0603 components — compatible with automated pick-and-place assembly without a feeder change.