{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"F204 B-125/0,5","brand":"ABB","brandSlug":"abb","productSlug":"F204-B-125-0~65","canonicalUrl":"https://aoctrl.com/abb/F204-B-125-0~65","factsUrl":"https://aoctrl.com/api/mcp/products/F204%20B-125%2F0%2C5","rawCanonicalId":null},"summary":{"shortDescription":"ABB F204 B-125/0,5 residual current circuit breaker, 4-pole, 125 A, 500 mA type B, 230/400 V AC, DIN-rail mount.","salesMarkdown":"The ABB F204 B-125/0,5 is a 4-pole residual current circuit breaker (RCCB) rated for 125 A continuous current and 500 mA residual trip threshold. It is a Type B device, meaning it detects smooth DC fault currents as well as AC and pulsed DC — essential for drives, UPS systems, and PV inverters where pure sine-wave residual currents can blind a standard AC or A-type RCCB. Rated 230/400 V AC, it fits three-phase four-wire networks (TN-S, TT) common in European industrial panels. The 125 A rated current (In) is the continuous load the RCCB can carry without overheating. For a 125 A frame, expect the upstream breaker to be sized at or below this — coordination studies typically target 80 % loading for thermal headroom in a 40 °C ambient. The 500 mA residual current is a high-threshold device — not for personnel protection (which needs 30 mA or less), but for equipment protection or fire prevention on large feeders where nuisance tripping from cable capacitance would plague a lower-sensitivity unit. Type B detection covers frequencies up to 1 kHz or more, so it handles the mixed-frequency leakage from VFD output cables without false trips. Pollution degree 2 means the RCCB is rated for non-conductive pollution that might become temporarily conductive due to condensation — typical of a clean industrial panel, not a washdown zone. The IP2X housing protects against fingers (12 mm probe), not water ingress. Power loss per pole is 7.5 W at rated conditions, so the total dissipation across four poles is 30 W. That heat must be considered in a crowded DIN-rail enclosure — adjacent devices may need derating or spacing.","metaTitle":"ABB F204 B-125/0,5 RCCB, 125 A, 500 mA, Type B, 4-Pole","metaDescription":"ABB F204 B-125/0,5 residual current circuit breaker, 125 A rated current, 500 mA type B, 4-pole, 230/400 V AC. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Type":"Residual Current Circuit Breaker","Model":"F204 B-125/0.5","Weight":"0,5 kg","of Poles":"4","Condition":"New","Shelf No.":"240220","Dimensions":"72 x 85 x 69 mm","Power Loss":"at Rated Operating Conditions per Pole 7.5 W","Manufacture":"Abb","Product No.":"2CSF204523R4950","Manufacturer":"ABB","Mounting Type":"DIN-Rail","Dimensions [mm]":"72 x 85 x 69","Type of Product":"Residual Current Circuit Breaker","lifecycle_stage":"current","Pollution Degree":"2","Rated Current (In)":"125 A","Ambient Temperature":"-25…40 °C","Degree of Protection":"IP2X","Nominal Voltage (Un)":"230/400 V AC","Nominal Voltage [AC]":"230/400 V","Rated Residual Current":"500 mA","Type of Residual Current":"B type","Rated Insulation Voltage (Ui)":"500 V","Rated Impulse Withstand Voltage (Uimp)":"4 kV"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/F204%20B-125%2F0%2C5/alternatives.json"},"ai":{"faq":[{"question":"What type of residual current does this RCCB detect?","answer":"Type B — it detects AC sinusoidal, pulsating DC, and smooth DC fault currents. This makes it suitable for circuits with variable-frequency drives, UPS systems, or photovoltaic inverters."},{"question":"What is the rated voltage and current?","answer":"Rated voltage 230/400 V AC (three-phase four-wire), rated current 125 A, rated residual current 500 mA."},{"question":"How many poles does it have?","answer":"4 poles — three phases plus neutral, all switched and protected."},{"question":"What is the mounting style?","answer":"DIN-rail mount, standard 35 mm rail per EN 60715."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/F204-B-125-0~65","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/F204-B-125-0~65 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}