Manuals+

TOMZN TO119G/TO219G/TO319G/TO419G

TOMZN MTS Dual Power Changeover Switch Instruction Manual

Models: TO119G, TO219G, TO319G, TO419G Series

1. Product Overview

The TOMZN TO419G series is a versatile manual isolation switch integrating four core functions: On, Off, Transfer, and Isolation. It enables safe switching or isolation between two loads on a single line or between two independent power sources. Constructed with a high-flame-retardant PA66 housing for durability, it is designed for easy DIN rail (35x7.5) mounting. Rated for 125A, it provides a reliable and safe solution for power switching and isolation in industrial equipment and circuits.

Key features include:

  • High-Current Capability
  • Quick Switch Mechanism
  • Interlocking Conversion (Two-in-one functionality)
  • Low Energy Consumption
  • Breakable Circuit Design
  • Flame Retardant Material (PA66 Housing)
Infographic highlighting key features of the TOMZN changeover switch: High-Current, Quick Switch, Interlocking Conversion, Low Energy Consumption, Breakable Circuit, Flame Retardant Material.
Figure 1: Key Features of the TOMZN Dual Power Changeover Switch.

2. Specifications

ParameterValueParameterValue
Model NumberTO119G/TO219G/TO319G/TO419GContact form1-0-2
StandardIEC/EN60947-3Electrical Life1500
Rated Voltage220/380V (400VAC 50/60Hz)Mechanical Life8500
Rated Current125AProtection degreeIP20
Rated Frequency50/60HzAmbient Temperature-5°C~40°C
Number of Poles1P/2P/3P/4PTerminal/Cable size16mm²
MountingOn DIN rail EN60715 (35mm) by means of fast clip deviceUi690V
Uimp4kVCertificationCE

Dimensions

Dimension diagram for the TO119G 1P model, showing width (36mm/1.42in), height (83mm/3.27in), and depth (78mm/3.07in).
Figure 2: TO119G (1P) Dimensions.
Dimension diagram for the TO219G 2P model, showing width (72mm/2.84in) and height (83mm/3.27in).
Figure 3: TO219G (2P) Dimensions.
Dimension diagram for the TO319G 3P model, showing length (108mm/4.25in) and height (85mm/3.35in).
Figure 4: TO319G (3P) Dimensions.
Dimension diagram for the TO419G 4P model, showing width (144mm/5.67in) and height (85mm/3.35in).
Figure 5: TO419G (4P) Dimensions.

3. Safety Information

WARNING: Electrical work should only be performed by qualified and licensed professionals. Improper installation or use can result in serious injury, death, or property damage. Always disconnect power before working on electrical circuits.

  • Ensure the main power supply is OFF before installation or maintenance.
  • Verify voltage and current ratings match your application.
  • Use appropriate personal protective equipment (PPE).
  • Do not operate the switch if it appears damaged.
  • The device is designed for indoor use in dry environments.
  • The housing is made of flame-retardant PA66 material, but proper ventilation should still be ensured.

4. Installation and Setup

4.1 DIN Rail Mounting

The TOMZN changeover switch is designed for easy installation and disassembly on a standard 35mm DIN rail.

  1. Align the switch with the DIN rail.
  2. Press the switch firmly onto the rail until it clicks into place.
  3. To remove, use a screwdriver to release the clip and lift the switch off the rail.
Image showing a TOMZN TO319G switch mounted on a 35mm DIN rail, illustrating easy installation.
Figure 6: DIN Rail Mounting.

4.2 Wiring Instructions

The changeover switch allows for manual conversion between common power and standby power sources to a single load. The position of the incoming and outgoing wires can be adjusted according to actual needs. However, when used for dual power switching, the lower terminals must be used for incoming power and the upper terminals for outgoing power (load).

Refer to the diagrams below for typical wiring configurations:

Wiring diagram for 2P (TO219G) and 3P (TO319G) models, showing 'Normal' and 'Ready' power inputs connected to lower terminals and 'Load' output from upper terminals.
Figure 7: Wiring Diagram for 2P and 3P Models.
Wiring diagram for 1P (TO119G) and 4P (TO419G) models, showing 'Normal' and 'Ready' power inputs connected to lower terminals and 'Load' output from upper terminals.
Figure 8: Wiring Diagram for 1P and 4P Models.

Terminal Identification:

Detailed view of the TO219G switch, labeling Power Terminal, TOMZN logo, Rated Current, Rated Voltage, and Operating Handle.
Figure 9: Product Appearance and Terminal Labels.
  • Power Terminal: Located at the top and bottom of the switch for connecting power sources and load.
  • Operating Handle: Used to manually switch between power sources or disconnect.

5. Operation

The TOMZN changeover switch features a manual operating handle with three distinct positions: I, Middle (OFF), and II. These positions control the connection between the two power sources and the load.

5.1 Operating Handle Positions

  • I Position: Connects the primary power source (e.g., 'Normal' power) to the load.

  • Middle Position (OFF): Disconnects both primary and secondary power sources from the load, providing complete isolation.

  • II Position: Connects the secondary power source (e.g., 'Ready' power) to the load.

5.2 Connection Logic by Pole Configuration

TO119G (1P Manual Transfer Switch)

  • I Position: Terminals 1 and 2 are connected.
  • II Position: Terminals 1 and 4 are connected.
  • Middle Position: Both groups are disconnected.
Diagram illustrating the connection states (I Position, Middle, II Position) for a 1P changeover switch (TO119G).
Figure 10: TO119G (1P) Operation.

TO219G (2P Manual Transfer Switch)

  • I Position: Terminals 1 and 2 are connected; Terminals 5 and 6 are connected.
  • II Position: Terminals 1 and 4 are connected; Terminals 5 and 8 are connected.
  • Middle Position: Both groups are disconnected.
Diagram illustrating the connection states (I Position, Middle, II Position) for a 2P changeover switch (TO219G).
Figure 11: TO219G (2P) Operation.

TO319G (3P Manual Transfer Switch)

  • I Position: Terminals 1 and 2 are connected; Terminals 5 and 6 are connected; Terminals 9 and 10 are connected.
  • II Position: Terminals 1 and 4 are connected; Terminals 5 and 8 are connected; Terminals 9 and 12 are connected.
  • Middle Position: Both groups are disconnected.
Diagram illustrating the connection states (I Position, Middle, II Position) for a 3P changeover switch (TO319G).
Figure 12: TO319G (3P) Operation.

TO419G (4P Manual Transfer Switch)

  • I Position: Terminals 1 and 2 are connected; Terminals 5 and 6 are connected; Terminals 9 and 10 are connected; Terminals 13 and 14 are connected.
  • II Position: Terminals 1 and 4 are connected; Terminals 5 and 8 are connected; Terminals 9 and 12 are connected; Terminals 13 and 16 are connected.
  • Middle Position: Both groups are disconnected.
Diagram illustrating the connection states (I Position, Middle, II Position) for a 4P changeover switch (TO419G).
Figure 13: TO419G (4P) Operation.

6. Maintenance

Regular maintenance ensures the longevity and safe operation of your TOMZN changeover switch.

  • Visual Inspection: Periodically inspect the switch for any signs of physical damage, discoloration, or loose connections.
  • Cleaning: Keep the switch clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
  • Connection Check: Ensure all terminal connections are tight and secure. Loose connections can lead to overheating and potential hazards.
  • Environmental Conditions: Ensure the operating environment remains within the specified ambient temperature range (-5°C to 40°C) and is free from excessive moisture or corrosive gases.
  • The switch features a thermoset housing, providing resistance to high temperatures.
Image showing a TOMZN changeover switch surrounded by flames, illustrating its thermoset housing and resistance to high temperatures.
Figure 14: Thermoset Housing for High Temperature Resistance.

7. Troubleshooting

If you encounter issues with your changeover switch, perform the following basic checks:

  • No Power to Load:
    • Check if the operating handle is in the 'Middle' (OFF) position. Move it to 'I' or 'II'.
    • Verify that both primary and secondary power sources are active.
    • Inspect all wiring connections for looseness or damage.
    • Check upstream circuit breakers or fuses for trips.
  • Switch Handle is Stiff or Stuck:
    • Ensure no foreign objects are obstructing the handle mechanism.
    • Do not force the handle. If it remains stiff, contact a qualified electrician.
  • Overheating:
    • Immediately disconnect power.
    • Check if the load current exceeds the switch's rated current (125A).
    • Inspect for loose terminal connections, which can cause resistance and heat.
    • Ensure adequate ventilation around the switch.

If the problem persists after performing these checks, consult a qualified electrician or contact customer support.

8. User Tips

  • Clear Labeling: Clearly label your 'Normal' and 'Ready' power sources at the switch for quick identification during operation.
  • Emergency Preparedness: Familiarize yourself with the switch's operation during non-emergency situations to ensure smooth transitions when needed.
  • Professional Installation: For complex setups or if you are unsure about electrical wiring, always opt for professional installation to ensure safety and compliance with local codes.

9. Warranty and Support

For technical support, warranty claims, or further assistance, please contact TOMZN Official Store customer service. When contacting support, please provide your product model number (TO119G/TO219G/TO319G/TO419G) and a detailed description of the issue.

This product is certified with CE, ensuring compliance with European safety standards.

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