MTN6635 and MTN6689 Series Power Supplies and Bus Couplers - KNX Infrastructure Components

The MTN6635 and MTN6689 series provide essential infrastructure components for KNX installations, including power supplies for bus powering and couplers for network segmentation and protocol translation.

The MTN663529 provides reliable 30V DC power for KNX bus devices in small to medium installations.

• Short-circuit protection: Electronic, auto-reset
• Overload protection: Current limiting at 350mA
• Overvoltage protection: 35V max output
• Thermal protection: Shutdown at 85°C
• Input fuse: Internal, non-replaceable

• Dimensions: 36mm * 90mm * 64mm (2 DIN modules)
• Mounting: 35mm DIN rail
• Terminals: Screw type, 0.5-2.5mm²
• Indicator: Green LED (output OK)
• Weight: 120g

The MTN663591 doubles the output capacity for larger installations:

• Large residential installations
• Small commercial buildings
• Multi-line systems (with coupler)
• Power-hungry devices (displays, gateways)

The MTN663592 provides two independent 320mA outputs for redundancy or separate line powering:

Line 1 ←──┬── MTN663592 Output 1 (320mA)
          │   (primary)
          │
Line 1 ←──┴── MTN663592 Output 2 (320mA)
              (backup, diode OR)

• Both outputs power same line
• If one fails, other maintains operation
• Diode isolation prevents back-feeding

Line 1 ←── MTN663592 Output 1 (320mA)
Line 2 ←── MTN663592 Output 2 (320mA)

• Two separate lines from one device
• Independent current limiting
• Cost-effective for medium installations

The MTN6635991 integrates battery backup for continuous operation during power outages:

• Normal output: 640mA @ 30V DC
• Battery type: 12V 7Ah lead-acid (external)
• Backup time: 2-8 hours (depending on load)
• Switchover time: <10ms (seamless)
• Battery monitoring: Automatic, with alerts

• Security systems (must operate during blackout)
• Emergency lighting control
• Fire alarm interfaces
• Access control systems
• Critical infrastructure

• Separates KNX lines for electrical isolation
• Filters telegrams (reduces bus load)
• Extends maximum installation size
• Enables line-specific power supplies

• Connection: 2* KNX interfaces (main line + sub-line)
• Isolation: 1000V galvanic separation
• Telegram filtering: Configurable
• Power: Derived from main line (no separate supply)
• Indicators: 2 LEDs (communication status)

Area Backbone
     │
     ├── Line Coupler 1 ── Line 1.1 (64 devices)
     │
     ├── Line Coupler 2 ── Line 1.2 (64 devices)
     │
     └── Line Coupler 3 ── Line 1.3 (64 devices)
     
Max: 15 areas * 15 lines * 64 devices = 14,400 devices

• Connects area backbone to main lines
• Higher message throughput
• Backbone communication management
• Inter-area telegram routing

• Large building complexes
• Campus installations
• Multi-building sites
• High-traffic networks

Power Supply (MTN663529)
        │
        └── All devices on single line

Power Supply (MTN663591)
        │
        ├── Line Coupler 1 ── Line 1 (64 devices)
        ├── Line Coupler 2 ── Line 2 (64 devices)
        ├── Line Coupler 3 ── Line 3 (64 devices)
        └── Line Coupler 4 ── Line 4 (64 devices)

Area Power Supply (MTN6635991)
        │
        ├── Area Coupler 1 ── Area 1 (4 lines, 256 devices)
        ├── Area Coupler 2 ── Area 2 (4 lines, 256 devices)
        └── ...