ALM Busy Circuits ALM 52 HP 3U case with power supply

52 HP 3U Eurorack Cases with Power Supply

• 52 HP 3U Eurorack case with integrated powered bus board
• Anodized aluminum construction, sturdy and extremely lightweight: approximately 0.7 kg
• Up to 1 A on the +12 V and -12 V lines, with a specified ripple of 100 mV at full load
• Shielded, low-noise DC/DC converter with overload and short-circuit protection
• Keyed connectors for up to 9 modules
• Fixed mounting rails with M3 threads; no sliding nuts
• Usable depth up to 42 mm, compatible with all ALM modules

The ALM Busy Circuits 52 HP 3U is the most compact of the ALM Eurorack cases with an integrated power supply. Designed for small, specialized systems, it’s perfect for a dedicated vocal track, a set of effects to complement your setup, or a small system you can always carry with you. Originally developed for the System Coupe, the ALM case has evolved into a range of formats available individually, all featuring an anodized aluminum frame, a power switch, rubber feet, and high-quality powered bus boards.

Compact ALM Eurorack Case in Anodized Aluminum

The all-anodized aluminum construction is durable yet extremely lightweight, with a total weight of approximately 0.7 kg. Its proportions are designed to sit comfortably on a table or desk—with a compact yet sufficient depth—and to fit easily into a bag or backpack. The external dimensions are 277 x 132 x 66 mm.

Fixed mounting rails with M3 threads

Instead of sliding nuts, which are often frustrating to position, the case uses fixed mounting rails with M3 threads. Screwing in the modules is quick and precise, with no screws spinning freely or nuts shifting out of place. The usable depth accommodates modules up to 42 mm thick—equivalent to approximately two stacked PCBs—and all ALM modules fit seamlessly.

Integrated low-noise Eurorack power supply

The fixed bus board provides ample power and keyed connectors to connect up to 9 modules without the risk of polarity reversal. The +12 V and -12 V lines deliver up to 1 A each, with a specified ripple of 100 mV at full load: a generous reserve for a case of this size. There is no +5 V line.

Shielded DC/DC Converter with Protections

The shielded DC/DC converter ensures a low-noise power supply and includes overload and short-circuit protection. The case is powered by an included 12 V external power supply, featuring a 2.1 mm center-positive barrel connector, and includes a power switch.

The ALM Eurorack Enclosure Series

The ALM chassis lineup also includes the 52 HP 6U format and the 84 HP 3U, 6U, and 9U formats, as well as a 19-inch rack-mountable 3U 84 HP version, allowing you to expand your system while maintaining the same build quality.

Technical Specifications

• Brand: ALM Busy Circuits
• Model: 3U, 52 HP Eurorack chassis with power supply
• Size: 3U, 52 HP
• Construction: Anodized aluminum
• Power supply: up to 1 A at +12 V and up to 1 A at -12 V; no +5 V line
• Specified ripple: 100 mV at full load
• Shielded, low-noise DC/DC converter with overload and short-circuit protection
• Connectors: keyed, for up to 9 modules
• Effective depth: up to 42 mm
• Mounting: fixed rails with M3 threads
• Power switch
• Rubber feet
• External power supply included: 12 V DC, 2.1 mm barrel connector (positive center)
• External dimensions: 277 x 132 x 66 mm
• Weight: approximately 0.7 kg