CMB-203-27G3N-B-A is a compact thermal circuit protector from the CMB-Series designed to provide overcurrent protection with push-to-reset functionality. This single-pole device operates at 125–250VAC or 32VDC with a current rating of 3–20A (specific rating determined by configuration), featuring a voltage drop of less than 0.25V and an interrupting capacity of 2500 amps at 32VDC. The unit includes an embossed aluminum indicator plate marked "Suppl. Prot. press to reset," operates reliably across -10°C to +60°C, and meets multiple international approvals including UL, CUL, CSA, TÜV, and CE standards with UL1500/ISO8846 certification for marine ignition protection. Its compact dimensions (1.154" × 1.781" × 1.325") and 3/8" 27 UNS mounting hole make it ideal for household appliances, transportation systems, marine equipment, power strips, medical devices, and audio-visual equipment requiring reliable thermal protection.