ANDERSEN 40ST Compact Below-Deck Electric Self-Tailing Winch 12V

The ANDERSEN 40ST Compact Below-Deck Electric is the brand's most space-efficient powered winch in the 40 size, built around a brushless DC Compact Motor that integrates the motor, planetary gearbox, and electronic controller into a single below-deck unit. It's the winch you fit when you want push-button sail trim on a 30-to-40-foot cruiser without giving up locker space to a separate control box, and without sacrificing the heirloom-quality stainless construction ANDERSEN is known for.

The drum side of the package is pure ANDERSEN. The 2-15/16-inch (75 mm) Power Rib drum is machined from solid stainless steel with the brand's exclusive vertical ribbing that grips the line aggressively under load without chewing it up, and the self-tailing device on top accommodates a wide range of line diameters from 5/16 to 9/16 of an inch (8-14 mm) without re-rigging. The base is 6 inches (152 mm) across, the overall height is 7-1/16 inches (180 mm), and the line entry sits at 3-1/8 inches (79 mm) above the deck , sized for the same load capacities as the manual 40ST but with electric drive replacing the winch handle.

What's new is everything below the deck. ANDERSEN's Compact Motor is a brushless DC motor matched to a low-profile planetary gearbox that draws considerably less current than the brushed-motor / right-angle-gearbox combinations that powered earlier electric winches. The motor depth is 7-1/16 inches (180 mm) below the deck and the motor diameter is 7-11/16 inches (195 mm), which is far less of a footprint than the older designs ate up. Because the controller lives inside the motor housing, you don't need to find a separate dry location for a control box , the only wiring run is the positive and negative power cables to the motor terminals, plus the included output cable to the deck-mount push button.

The push button is part of the system, not an afterthought. It's an illuminated, IP67-rated waterproof switch with a hinged safety cover that prevents inadvertent operation when someone steps on it, and the LED inside lights up whenever the winch system has power. The button also doubles as a diagnostic interface , if the controller intervenes for any reason, the LED flashes a status code that tells you whether the issue is overload, thermal cutout, or another protection event. That eliminates the older approach where you'd have to pop a panel and read a fault code off the controller itself.

The variable-speed behavior is the second big selling point. Earlier electric winches were on/off , you pushed the button and the winch ran at one speed until you released. The Compact Motor responds to pressure on the push button: light pressure trims slowly for precision sheet adjustments, full pressure runs the winch at maximum speed for fast hoists. That's a real ergonomic upgrade for short-handed sailing, where one person at the helm and one at the winch can fine-tune a genoa trim during a tack without the winch overshooting.

Protection is layered. Integrated overload protection in the controller stops the motor if the load exceeds the maximum pull limit, and operation can resume within a few seconds when the load returns below the limit , there's no manual reset to chase down. The motor itself carries a separate thermal cutout that disables it if internal temperatures climb past spec, with automatic reset once the motor cools. Together they protect both the winch and your wiring from the most common failure modes that retire sailing winches early.

Installation is straightforward by the standards of below-deck winches. The deck cutout and through-bolt pattern match the manual 40ST, so this is a viable retrofit for boats that already have a 40-size winch and want to convert to electric. The maximum deck thickness the motor will accept is 2-1/8 inches (54 mm), which covers nearly every modern cored-deck cruiser. Total weight of the winch and motor is 40 pounds (18 kg), so two people can lift it into place during install.

Where this winch fits in the ANDERSEN line: it's the smaller electric option below the 46ST and 50ST. For a 30-to-35-foot cruiser running a 110-130 percent genoa, the 40 size is the right primary winch. For sailors stepping up from manual sheeting because their crew is changing , older parents, a partner without the upper-body strength to grind a winch handle on a hard reach, or simply the goal of solo-sailing more confidently , this is the entry point into ANDERSEN's powered range.

Two notes on what's not included. There's no breaker, fuse, or main cabling in the box , you spec those to suit your battery bank and the run length from battery to motor. ANDERSEN publishes minimum cable sizes in the install guide. And while this is the 12V model, ANDERSEN also offers a 24V version of the same winch on the same drum body, which is the right call for larger boats with 24V house systems.