The ACB-04425 is a moisture-resistant terminal block optimized for humid or damp environments, combining compact design with robust protection against water ingress.
ACB 04425
XLCF
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Center Space | 6.00mm |
Rated Current | 60A |
Screw | M4 |
Terminal Body | Brass, Tin Plated |
Screw Torque | 13 lbf·in |

ACB 04425 Product Diagram
Featuring a 5.08mm center space (compatible with standard PCBs) and a 300V AC/DC, 8A rating, it operates across a temperature range of -40℃ to 105℃, making it suitable for indoor damp spaces (e.g., bathrooms, kitchens) and outdoor semi-enclosed areas (e.g., patio lighting). Constructed with UL94 V-0 flame-retardant PA66 insulation (enhanced with anti-mildew additives) and tin-plated brass terminals, it resists mold growth and corrosion—key for humid settings. Its IP44 ingress protection rating (against splashing water and solid particles) adds an extra layer of safety, while 3500V surge voltage resistance shields connected devices (e.g., smart faucets, outdoor LED lights) from power spikes. With a 11.8mm width and support for custom pole counts, the MCB-04425 balances space efficiency with moisture durability.
Anti-Mildew PA66 Insulation: Modified PA66 with anti-fungal additives prevents mold growth in high-humidity environments (e.g., bathroom exhaust fan controls, poolside lighting). It meets UL94 V-0 flame retardancy and resists water splashes (IP44 rating).
Tin-Plated Brass Terminals: Tin plating enhances corrosion resistance (tested to 500 hours of salt spray per ASTM B117) and maintains low electrical resistance (<0.002Ω per terminal). Unlike standard brass, tin-plated terminals avoid "green oxidation" in damp air.
Sealed Screw Holes: M2.5 steel screws fit into sealed holes that block moisture ingress, reducing the risk of rust-related loose connections. The screws are coated with zinc-nickel for added rust protection.
Low-to-Medium Power Rating: 300V/8A capacity fits moisture-prone applications like bathroom smart mirrors (12V DC/2A), outdoor string lights (120V AC/0.5A), or kitchen garbage disposal controls (120V AC/6A).
Surge Voltage Protection: Withstands 3500V transient spikes, shielding devices from lightning-induced surges (outdoor use) or power grid fluctuations (indoor use).
Wire Compatibility: Accepts 30–16 AWG wires, covering thin sensor wires (30 AWG for humidity sensors) and moderately thick power wires (16 AWG for small pumps). The clamping mechanism accommodates both solid and stranded wires, with a recommended stripping length of 8mm.
IP44 Compliance: Safe for use in areas with splashing water (e.g., near sinks, outdoor rain shelters). For fully submerged applications (e.g., pool pumps), pair with an IP68 enclosure.
Supports 2P to 4P configurations, with total length calculated as L = 5.08mm × Poles. A 3P setup (15.24mm total length) fits into 18mm-wide damp enclosures (e.g., outdoor lighting junction boxes).
Dual Mounting: Works with PCBs (3.0mm holes) and aluminum panels (3.2mm holes), using M2.5 mounting screws (torque: 3.5 lbf·in max).
Bathroom & Kitchen Electronics: Used in smart faucets, exhaust fan controls, bathroom mirrors with LED lighting, and garbage disposal wiring. Anti-mildew insulation prevents mold growth, while IP44 protection resists water splashes.
Laundry Room Equipment: Connects power wires for washing machine sensors, dryer vent fans, and smart laundry trackers. The -40℃ to 105℃ range handles temperature fluctuations, and tin-plated terminals resist detergent-related corrosion.
Patio & Garden Lighting: Integrates into outdoor LED string lights, pathway lights, and landscape lighting controls. IP44 protection resists rain splashes, while surge protection safeguards against lightning-induced spikes.
Poolside & Spa Equipment: Used in pool light controls, spa temperature sensors, and small water pump wiring (e.g., fountain pumps). The moisture-resistant design avoids short circuits from pool water splashes.
Grocery Store Refrigeration: Connects sensors and fans in walk-in coolers (high humidity) and display freezers. Anti-mildew insulation prevents mold in cool, damp air, while the 8A rating handles cooler fan power needs (24V DC/5A).
Restaurant Kitchens: Used in under-sink garbage disposals, dishwashing machine sensors, and exhaust hood controls. IP44 protection resists water splashes from sinks, and UL94 V-0 insulation meets commercial kitchen safety standards.
"MCB" denotes "Moisture-Resistant Compact Block," highlighting the terminal’s core advantages: IP44 moisture protection, anti-mildew insulation, and slim 11.8mm width. This differentiates it from standard MCU/MCF-series terminals (focused on high temp or general compactness).
It can be used in semi-enclosed outdoor areas (e.g., covered patios, under eaves) where it only encounters splashing water (IP44-rated). For fully exposed areas (e.g., open garden beds), use an IP65 enclosure to protect against heavy rain or direct sunlight.
No. Aluminum wires oxidize quickly in humid environments, forming a high-resistance layer that causes overheating. The ACB-04425 is designed for copper wires (30–16 AWG)—copper’s corrosion resistance and conductivity pair best with the tin-plated terminals.
Use 3.5 lbf·in (max) for both wire-clamping and mounting screws. Exceeding this torque can crack the PA66 insulation (especially in damp environments, where insulation may be more prone to stress) or strip the screw threads.