Mitsubishi S-N50 Magnetic Contactor with TH-N60 Relay 100-127V AC
Original price was: $699.00.$600.00Current price is: $600.00.
Condition: New – Open Box
1 in stock
Mitsubishi S-N50 Magnetic Contactor with TH-N60 Thermal Overload Relay (100-127V AC 50/60Hz)
The Mitsubishi Electric S-N50 magnetic contactor paired with the TH-N60 bimetallic thermal overload relay is an industrial-grade non-reversing motor starter assembly designed for heavy-duty operational cycles. Engineered for high inductive load switching (AC-3 duty), this combination handles continuous operational currents up to 50A (at 440V AC) with motor output ratings up to 30 kW.
Equipped with a wide-band 100–127V AC 50/60Hz operating coil, this unit reliably mitigates control voltage dropouts common in remote marine switchboards, offshore distribution panels, and emergency generator control systems. The direct-coupled TH-N60 thermal overload relay provides multi-phase overload protection, integrated phase-loss (single-phasing) differential tripping, and manual/auto reset flexibility.
Model Details:
- Manufacturer Part Number (MPN): S-N50-AC100-127V-TH-N60
- Base Contactor Model: S-N50
- Direct Mount Overload Relay: TH-N60
- Assembly Type: Direct-coupled non-reversing motor starter with auxiliary contacts
Technical Specifications:Â
| Parameter | Specification Value |
|---|---|
| Main Contactor Model | Mitsubishi Electric S-N50 |
| Overload Relay Model | TH-N60 (Direct Mount, 3-Heater Class 10A) |
| Main Poles / Phase Configuration | 3-Pole (3P), 3NO Power Contacts |
| Rated Insulation Voltage (Ui) | 1000V AC (Contactor) / 690V AC (Relay) |
| Rated Operational Voltage (Ue) | Up to 690V AC, 50/60 Hz |
| Rated Operational Current (Ie) AC-3 | 200-240V: 60A | 380-440V: 50A | 500V: 40A | 690V: 30A |
| Motor Power Rating (AC-3) | 200-240V: 15 kW | 380-440V: 25-30 kW | 500V: 25 kW |
| Conventional Free Air Thermal Current (Ith) | 80A (AC-1 / Non-inductive) |
| Control Coil Voltage Rating | 100V–127V AC @ 50/60 Hz (Usable: 85V–139V AC) |
| Coil Power Consumption | Inrush: 145 VA | Sealed: 12 VA (approx. 3.4W) |
| Auxiliary Contact Configuration | 2NO + 2NC (Contactor) + 1NO/1NC (Relay Trip Contacts) |
| Thermal Relay Setting Ranges (Common) | 20-28A, 24-34A, 30-40A, 34-50A, 43-65A (Selectable) |
| Power Terminal Allocation | M6 Screw Terminals (Recommended Torque: 3.5–4.5 N·m) |
| Control/Auxiliary Terminal Allocation | M3.5 Screw Terminals (Recommended Torque: 0.8–1.2 N·m) |
| Mechanical / Electrical Life Endurance | 5,000,000 operations / 1,000,000 operations (AC-3) |
| Mounting Options | 35mm standard DIN Rail (IEC/EN 60715) or Screw Mounting |
| Operating Temperature Range | -10°C to +55°C (Storage: -40°C to +65°C) |
Key Features
- High-Capacity Arc Quenching: Features heavy-duty silver-alloy main contacts with arc chutes designed for inductive motor loads (AC-3) up to 50A/30kW at 400–440V AC.
- Phase-Loss Differential Mechanism: TH-N60 relay incorporates a 3-heater element layout with differential expansion linkage to trip rapidly during single-phasing events.
- Wide Voltage Operating Band: The 100–127V AC (50/60Hz) coil operates between 85% and 110% rated control voltage, preventing coil burnouts from shipboard voltage fluctuations.
- Bifurcated Auxiliary Switching: Standard 2NO + 2NC auxiliary block with high-contact reliability suitable for low-level PLC inputs down to 5V DC, 3mA.
- Front-Facing Direct Diagnostic Access: Includes a mechanical trip indicator, manual test trip button, hand/auto reset selector, and current adjustment dial with transparent protective cover.
Applications
- Marine Auxiliary Starters: Sea water circulating pumps, bilge/ballast pumps, fuel oil separators, starting air compressors, and engine-room ventilation blowers.
- Industrial Motor Controls: Hydraulic power packs, chillers, heavy-duty conveyor drives, blowers, and crane hoist drives.
- Automation & MCC Panels: Main switchboard panels, power distribution skids, and industrial factory motor control centers.
Frequently Asked Questions
What is the difference between the Mitsubishi S-N50 and the newer S-T50 contactor?
The S-T series is Mitsubishi’s modern replacement line featuring a slightly narrower body and updated terminal shrouds. The S-N50 remains standard across legacy marine switchboards and industrial cabinets due to exact drop-in dimensions, identical terminal numbering, and high stock availability for marine refits.
Can the 100–127V AC coil operate on 110V DC control circuits?
No. The standard S-N50 100–127V AC unit uses an AC-rated electromagnet assembly. Applying DC voltage will overload and burn out the coil. For DC control circuits, use the dedicated DC-operated model (SD-N50).
How do I adjust the thermal trip current on the TH-N60 relay?
Turn the front dial to align the indicator arrow directly with the rated Full Load Current (FLC / FLA) printed on your motor’s nameplate. Do not set it higher than the motor rating; the relay already accounts for standard starting inrush curves.
Does the TH-N60 thermal overload relay protect against single-phase motor failure?
Yes. The TH-N60 utilizes a differential mechanism that accelerates tripping under single-phasing (phase loss) conditions, preventing the remaining motor windings from catastrophic thermal burnout.
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