The Schneider Electric MTN684064 is the industry-standard SpaceLogic KNX bus power supply rated at 640 mA. It generates regulated 30 V DC SELV for a full KNX line (typically up to ~64 devices) with an integrated choke that separates the DC feed from bus telegrams on the twisted pair.

A front-panel bus-reset push-button disconnects bus power to reset all connected devices — essential for commissioning and troubleshooting. The supply is short-circuit proof, accepts AC 110–230 V (92–253 V tolerance), and mounts on 4-module DIN rail in light grey. For aux output and parallel options see MTN6513-1202; for 320 mA see MTN684032 or MTN6513-1203.

Key Features — 640 mA Line Power

Bus Supply and Reset

• Output: 640 mA max. at 30 V DC with integrated choke.
• Bus reset: Push-button disconnects power to reset all line devices.
• Short-circuit proof: Protects PSU and field devices from wiring faults.
• Wide mains range: AC 110–230 V nominal (92–253 V), 50/60 Hz ±10%.
• Simple wiring: Bus terminal connection — no separate data rail required.

At a Glance

Specification	Detail
Order code	MTN684064
Output current	640 mA (max.)
Bus voltage	30 V DC SELV
Device width	4 modules (≈ 72 mm)
Mains supply	AC 110–230 V, 50/60 Hz

Full electrical and mechanical data are under Technical Specifications. Official Schneider documentation is under Downloads.

Applications and KNX Integration

• Standard KNX lines: Default choice for mixed MTN6700, MTN6300, and MTN6212 installations.
• IP projects: Power MTN6500-0103 routers and MTN6502-0105 interfaces on the same segment.
• Large buildings: One MTN684064 per line; structure with MTN6500-0101 couplers.
• High-density lines: Upgrade to MTN6513-1201 (1280 mA) when current budget is exceeded.
• Time programs: Pair with MTN6606-0008 year time switch on the bus.

Choosing MTN684064 vs MTN6513-1202

Use MTN684064 for the most common 640 mA bus-only line with bus-reset and compact 4-module width. Choose MTN6513-1202 when you need auxiliary 30 V, signaling contact, or parallel expansion to 1280 mA.