Manuals+

TOMZN TO419G NEW

TOMZN Manual Transfer Switch (MTS) Instruction Manual

Models: TO119G, TO219G, TO319G, TO419G Series

1. Introduction

The TOMZN Manual Transfer Switch (MTS) is a critical electrical device designed to provide a reliable power supply for essential circuits. It serves as a secure bridge between two independent power sources, typically the utility power (main source) and a generator (backup source).

Key functions include:

  • Safe Power Source Transfer: Manually shifts the electrical load from a failed or de-energized main power source to a live backup source, ensuring continuous operation of critical systems.
  • Complete Electrical Interlocking: A safety mechanism prevents both power sources from being connected simultaneously, avoiding short circuits, equipment damage, and hazards to utility workers.
  • Isolation and Operator Control: Features a clear "OFF" or "Open" position for complete physical isolation of the load from both sources, enabling safe maintenance and servicing. Manual operation with clearly marked positions (e.g., "Line 1," "Line 2," "Off") provides full operator control.
TOMZN Manual Transfer Switches, various pole configurations
Figure 1: Overview of TOMZN Manual Transfer Switches (1P, 2P, 3P, 4P models).

2. Specifications

The TOMZN MTS series is available in various pole configurations and current ratings. Refer to the table below for general specifications and specific model details.

AttributeSpecification
Brand NameTOMZN
TypeMini Circuit breaker, Manual Transfer Switch
Model NumbersTO119G, TO219G, TO319G, TO419G
Poles Number1P, 2P, 3P, 4P (depending on model)
Rated Voltage220/380V AC or 400V AC (depending on model)
Rated Current40A / 63A (as per model)
Rated Frequency50/60Hz
Contact Form1-0-2
Electrical Life1500 cycles
Mechanical Life8500 cycles
Protection DegreeIP20
Ambient Temperature-5°C to 40°C
Terminal/Cable Size1.5 - 16 mm² (Torque: 1.8 Nm)
MountingOn DIN rail EN60715 (35mm) by means of fast clip device
CertificationCE
Is Smart DeviceNo
Housing MaterialThermoset plastic (flame retardant)
TO219G 2P Model Specifications and Dimensions
Figure 2: Specifications and dimensions for TO219G (2P) model, 400V AC.
TO119G 1P Model Specifications and Dimensions
Figure 3: Specifications and dimensions for TO119G (1P) model, 400V AC.
TO319G 3P Model Specifications and Dimensions
Figure 4: Specifications and dimensions for TO319G (3P) model, 400V AC.
Back view of a TOMZN breaker showing terminal specifications
Figure 5: Terminal specifications, including wire size (1.5-16mm²) and torque (1.8 Nm).

3. Safety Information

  • Always ensure power is disconnected from both sources before installation or maintenance.
  • Installation should be performed by a qualified electrician in accordance with local electrical codes and regulations.
  • Do not attempt to bypass the interlocking mechanism.
  • Ensure proper wire sizing and terminal connections to prevent overheating and electrical hazards.
  • The device is designed for manual operation only. Do not attempt to automate the switching process unless explicitly designed for such a purpose.
  • The thermoset housing provides flame retardant properties, but the device should still be installed in an appropriate enclosure.

4. Installation

4.1 Mounting

The TOMZN MTS is designed for mounting on a standard 35mm DIN rail (EN60715). The fast clip device allows for simple and convenient installation and disassembly.

DIN Rail Mounting for TOMZN Manual Transfer Switch
Figure 6: Illustration of DIN rail mounting.

4.2 Wiring

Connect the main power source and the backup power source to the designated terminals. The load should be connected to the output terminals. Ensure all connections are secure and tightened to the specified torque (1.8 Nm for 1.5-16mm² cables).

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 to the load.

Wiring Diagram for 1P and 3P Manual Transfer Switches
Figure 7: Wiring diagram for 1P and 3P models, showing connections for Load, Normal (Main Power), and Ready (Backup Power).
Wiring Diagram for 2P and 4P Manual Transfer Switches
Figure 8: Wiring diagram for 2P and 4P models, showing connections for Load, Normal (Main Power), and Ready (Backup Power).

5. Operation

The Manual Transfer Switch allows for safe and controlled switching between two power sources using a robust operating handle. The handle design is reinforced and widened for comfortable operation.

Operating Handle Design of TOMZN MTS
Figure 9: Reinforced and widened operating handle for comfortable use.

5.1 Handle Positions and Connections

The switch has three distinct positions:

  • I Position: Connects to the first power source (e.g., utility power).
  • II Position: Connects to the second power source (e.g., generator/backup power).
  • Middle Position: All connections are disconnected, providing complete isolation.

TO119G (1P) Operation:

  • I Position: Terminals 1 and 2 are connected.
  • II Position: Terminals 1 and 4 are connected.
  • Middle Position: Both groups are disconnected.
TO119G 1P Operation Diagram
Figure 10: 1P model operation, showing connections for I, Middle, and II positions.

TO219G (2P) Operation:

  • 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.
TO219G 2P Operation Diagram
Figure 11: 2P model operation, showing connections for I, Middle, and II positions.

TO319G (3P) Operation:

  • 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.
TO319G 3P Operation Diagram
Figure 12: 3P model operation, showing connections for I, Middle, and II positions.

TO419G (4P) Operation:

  • 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.
TO419G 4P Operation Diagram
Figure 13: 4P model operation, showing connections for I, Middle, and II positions.

6. Maintenance

Regular maintenance ensures the longevity and safe operation of your Manual Transfer Switch. Always disconnect power from both sources before performing any maintenance.

  • Visual Inspection: Periodically inspect the switch for any signs of physical damage, discoloration, or loose connections.
  • Terminal Tightness: Check and re-tighten terminal screws as necessary to ensure good electrical contact. Refer to the specified torque of 1.8 Nm.
  • Cleanliness: Keep the switch free from dust, dirt, and moisture. Use a dry, non-abrasive cloth for cleaning.
  • Operational Check: Test the switch operation periodically by manually moving the handle through all three positions (I, Middle, II) to ensure smooth movement and proper engagement.

7. Troubleshooting

If you encounter issues with your TOMZN Manual Transfer Switch, consider the following common troubleshooting steps:

  • No Power to Load:
    • Verify that both the main and backup power sources are active.
    • Ensure the switch handle is fully engaged in either the "I" or "II" position, not in the "Middle" (OFF) position.
    • Check all wiring connections for tightness and proper installation.
    • Inspect upstream circuit breakers or fuses for trips or failures.
  • Switch Handle is Stiff or Stuck:
    • Do not force the handle.
    • Ensure there is no physical obstruction.
    • If the issue persists, the internal mechanism may be damaged, and the unit should be replaced by a qualified professional.
  • Overheating or Burning Smell:
    • Immediately disconnect all power sources.
    • This indicates a serious electrical issue, likely due to loose connections, overloaded circuits, or internal damage. Do not re-energize the system. Contact a qualified electrician for inspection and repair/replacement.

For complex issues or if you are unsure about any troubleshooting step, always consult a qualified electrician.

8. User Tips

No specific user tips were available from reviews or Q&A for this product. However, general best practices for electrical switches include:

  • Always label your power sources clearly for easy identification.
  • Perform regular visual checks of your electrical panel and components.
  • Consider periodic testing of your backup power source (generator) to ensure it's ready when needed.

9. Frequently Asked Questions (FAQ)

No specific FAQ content was available for this product.

Q: What is the purpose of a Manual Transfer Switch?
A: A Manual Transfer Switch allows you to safely switch your electrical load between two different power sources, typically utility power and a backup generator, ensuring that only one source is connected at a time.

Q: Can I install this myself?
A: Installation of electrical devices like this should always be performed by a qualified electrician to ensure safety and compliance with local electrical codes.

Q: What does "1-0-2" contact form mean?
A: "1-0-2" indicates that the switch has three positions: "1" for the first power source, "0" for an OFF/isolated position, and "2" for the second power source.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact TOMZN directly. Refer to the contact details below:

  • Brand: TOMZN INTERNATIONAL ELECTRIC
  • Website: www.tomzn.com, www.tomznelectric.com
  • Service Hotline: 4006-020-158
  • Email: arlen@tomzn.com
  • Address: No.11, Xinhe Road, Huabei, Liushi Town, Yueqing City, Zhejiang Province, China
TOMZN International Electric Contact Information
Figure 14: TOMZN International Electric contact details.

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