MTN625 Series Relay Control Modules - High-Power Switching Solutions

The MTN625 series provides robust relay-based switching for high-power loads and demanding applications. From standard lighting circuits to heavy-duty equipment control, these modules deliver reliable performance with comprehensive protection features.

Relay Specifications:

• Type: Electromechanical relay, SPDT
• Contact material: Silver-tin oxide (AgSnO2)
• Rated current: 16A AC1 (resistive)
• Switching capacity: 4000VA
• Mechanical life: >10,000,000 operations
• Electrical life: >100,000 operations (at rated load)

Load Compatibility:

Electrical Characteristics:

• Control voltage: 230V AC ±10%
• Coil consumption: 2VA (during switching)
• Switching time: <20ms
• Release time: <15ms
• Contact resistance: <100mΩ (new)

Protection Features:

• Overvoltage protection: Varistor across contacts
• Freewheeling diode: For DC coil applications
• Thermal protection: Automatic reset at 85°C
• Short-circuit protection: External fuse required (B16 recommended)

Independent Dual Control:

The MTN625234 offers two separately controllable relay channels in one compact housing:

Channel Specifications (each):

• Rating: 10A/250V AC
• Switching capacity: 2500VA
• Independent control: Yes
• Common neutral: Optional
• Cross-interlock: Programmable

Applications:

• Two-way lighting control
• Blinds up/down (interlocked)
• Heating/cooling switchover
• Pump alternation (duty/standby)

Wiring Configuration:

MTN625234 Terminal Layout:

L1  N1  LOAD1A  LOAD1B
│   │    │       │
│   │    │       └── NC contact (optional)
│   │    └────────── NO contact
│   └─────────────── Neutral (channel 1)
└─────────────────── Line (channel 1)

L2  N2  LOAD2A  LOAD2B
│   │    │       │
│   │    │       └── NC contact (optional)
│   │    └────────── NO contact
│   └─────────────── Neutral (channel 2)
└─────────────────── Line (channel 2)

Local Control Capability:

The MTN625514 adds a manual override switch for emergency and maintenance situations:

Override Functions:

• AUTO position: Normal KNX control
• ON position: Force relay closed
• OFF position: Force relay open
• Status LED: Indicates actual relay state

Safety Applications:

• Emergency lighting test
• Fire alarm override
• Maintenance mode
• Fail-safe operation

Override Behavior:

High-Current Applications:

The MTN625760 handles loads up to 25A, suitable for demanding applications:

Enhanced Specifications:

• Contact rating: 25A/250V AC (AC1)
• Switching capacity: 6250VA
• Contact gap: 3mm (enhanced isolation)
• Contact force: High-pressure design
• Arc suppression: Built-in quenching

Suitable Loads:

• Electric water heaters (up to 5.7kW)
• Air conditioning units
• Industrial fans and blowers
• Commercial lighting banks
• Motor loads up to 1.5kW (with appropriate protection)

Installation Requirements:

• Minimum wire cross-section: 4mm²
• Terminal torque: 2.5Nm
• Heat dissipation: Adequate ventilation required
• External protection: C25 circuit breaker recommended

Load Calculation:

Total Load = Sum of all connected devices * Diversity factor

Example:
- 10* LED downlights @ 10W each = 100W
- 2* LED strips @ 50W each = 100W
- Inrush factor for LEDs = 1.5
- Total design load = 200W * 1.5 = 300W
- Required relay: MTN625560 (16A = 3680W, sufficient)

Cable Sizing:

Protection Coordination:

• Relay rating: 16A or 25A
• Circuit breaker: B-characteristic, same rating
• Cable rating: Exceed relay rating by 25%
• Earth leakage: 30mA RCD for portable, 300mA for fixed