TOMZN TO419G 4P 63A Manual Transfer Switch MTS – 400V AC

TOMZN TO419G 4P 63A Manual Transfer Switch – 400V AC

The TOMZN TO419G 4P 63A Manual Transfer Switch (MTS) is designed for manually switching between two electrical power sources in dual-power supply systems. With a 4-pole configuration, 63A rated current and 400V AC rating, it is suitable for applications where controlled changeover between normal and standby power is required.

The TO419G uses a three-position I–0–II operating arrangement. In position I, the first power source is connected; in position II, the second power source is connected; and in the middle position, both power sources are disconnected. TOMZN documentation specifically identifies the TO419G as a 4P 400V AC manual transfer switch.

Key Features

• 63A rated current
• 4-pole (4P) configuration
• 400V AC rated voltage
• Manual Transfer Switch (MTS)
• I–0–II three-position operation
• Designed for dual power supply systems
• Interlock mechanism helps prevent simultaneous connection of the two sources
• 35mm DIN rail mounting
• Suitable for grid and generator changeover applications
• Suitable for residential, commercial and industrial installations
• Compact modular design for electrical distribution panels

The TOMZN TO419G is specified for 4P, 63A operation and DIN-rail mounting; TOMZN documentation also describes the I, middle and II operating positions and their corresponding terminal connections.

Dual Power Manual Transfer Switch

The TOMZN TO419G is intended for systems where electrical loads need to be manually transferred between two independent power sources.

Typical examples include:

Normal Power → Standby Power

For example, one source may be the utility/grid supply while the second source may be a generator or another backup supply.

The manual mechanism gives the operator direct control over the selected source rather than automatically transferring the load.

I–0–II Changeover Operation

The TO419G has three operating positions:

Position I

Connects the first power source to the corresponding output terminals.

Middle Position – 0

Both power-source groups are disconnected.

Position II

Connects the second power source to the corresponding output terminals.

For the 4P TO419G, TOMZN's wiring documentation specifies the terminal relationships for each position.

4-Pole Configuration

The 4P design provides four switched poles, making the TO419G suitable for power-transfer arrangements where all required conductors need to be switched between the two sources.

This makes the product suitable for appropriately designed three-phase power systems and dual-source distribution panels.

DIN Rail Installation

The TOMZN TO419G is designed for 35mm DIN rail mounting, allowing it to be installed inside compatible electrical distribution boards, control panels and power-transfer enclosures. TOMZN documentation specifies DIN rail mounting using a fast-clip arrangement.

Applications

The TOMZN TO419G 4P 63A Manual Transfer Switch can be used for:

• Grid and generator changeover
• Dual power supply systems
• Backup power systems
• Residential electrical panels
• Commercial distribution panels
• Industrial power distribution
• Generator transfer applications
• Solar backup power systems
• Electrical control panels
• Three-phase AC power systems

Current Pakistan listings also position the TO419G for residential, commercial, industrial and solar-backup applications.

Normal Working & Installation Conditions

Based on the supplied product information, the recommended conditions are:

• Ambient temperature: -5°C to +40°C
• Maximum average temperature over 24 hours: +35°C
• Maximum installation altitude: 2000m
• Relative humidity: Up to 50% at +40°C
• Higher humidity may be permitted at lower temperatures according to the specified conditions
• Installation should account for condensation/dew caused by temperature changes

Technical Specifications

TOMZN's own product information lists the TO419G as a 4P 400V AC manual transfer switch, while its product specification page lists 40A/63A variants and 240/415V depending on the configuration. The product image supplied here specifically shows the 63A / 400V / 50–60Hz marking, so those values are used for this product listing. 

Frequently Asked Questions

What is the TOMZN TO419G?

The TOMZN TO419G is a 4-pole Manual Transfer Switch (MTS) designed for manually transferring an electrical load between two power sources.

What is the current rating of the TO419G?

This product is the 63A version of the TO419G.

Is the TOMZN TO419G a 4-pole switch?

Yes. The TO419G shown here is a 4P (4-pole) manual transfer switch. 

What voltage is the TOMZN TO419G rated for?

The supplied product image identifies the 63A model as 400V AC, 50/60Hz. TOMZN's product documentation also identifies the TO419G 4P version as 400V AC.

Can the TO419G switch between grid and generator power?

Yes. It is designed for dual power-source changeover, making it suitable for appropriately designed grid/generator backup systems.

Does the TO419G have an interlock?

Yes. The TO419G uses an interlock arrangement to prevent the two power-source positions from being connected simultaneously during normal operation.

Is the TOMZN TO419G DIN rail mountable?

Yes. The TO419G is designed for 35mm DIN rail mounting. 

Does the TO419G automatically transfer power?

No. The TO419G is a Manual Transfer Switch. The operator manually selects position I, 0 or II. It should not be marketed as an automatic transfer switch (ATS).