Phoenix Contact UT 4-TG Disconnect Terminal Block

Technical Overview

500V, 20A disconnect terminal block with screw connection for 0.14-6mm² conductors. DIN rail mount, -60 to 110°C, UL 94 V-0 rated. Ideal for industrial safety.

Key Features

Internationally proven screw connection.
Maintenance-free and vibration-resistant with Reakdyn principle.
Space savings and flexibility with the connection of two identical conductors.
Long-term stable connections with high-quality materials.
Low self-heating due to high contact forces.
Full flexibility with standardized CLIPLINE complete bridging, marking, and testing accessories.
Individual and easy assembly with isolating plug, fuse plug, component connector, and feed-through connector.
Tested for railway applications.
Removable disconnect function.

Technical Specification Matrix

Parameter	Value
Nominal Voltage	500 V
Nominal Current (IN)	20 A (with 4 mm² conductor cross-section)
Maximum Load Current	20 A (with 6 mm² conductor cross-section)
Connection Method	Screw connection
Nominal Cross Section	4 mm²
Conductor Cross Section Rigid	0.14 mm² - 6 mm²
Conductor Cross Section Flexible	0.14 mm² - 6 mm²
Wire Gauge Range (AWG)	26 AWG - 10 AWG
Mounting Type	DIN rail (NS 35/7,5, NS 35/15)
Color	Gray (RAL 7042)
Insulating Material	PA (Polyamide)
Flammability Rating	UL 94 V-0
Operating Temperature	-60 °C to 110 °C
Rated Surge Voltage	6 kV
Degree of Pollution	3
Overvoltage Category	III
Number of Levels	1
Number of Connections per Level	2
Screw Thread	M3
Tightening Torque	0.6 - 0.8 Nm
Stripping Length	9 mm
Depth on NS 35/15	55 mm
Physical Weight (kg)	0.01
Dimensions L x W x H (cm)	4.75 x 0.62 x 5.78

Industrial Applications

1. Industrial Control Panel Wiring for Maintenance and Troubleshooting

This disconnect terminal block is ideal for safely isolating circuits within industrial control panels for routine maintenance, component replacement, or troubleshooting without de-energizing the entire panel. Its screw connection ensures reliable contact in vibration-prone environments.

Problem Solved

Prevents accidental shock during maintenance by providing a clear, verifiable point of disconnection for individual circuits. Reduces downtime by allowing localized fault finding without affecting other operations.

Electrical isolationControl panelMaintenanceTroubleshootingScrew connectionDIN rail500V20A

2. Railway Signaling and Control Systems

Given its testing for railway applications and robust temperature range, this terminal block is suitable for use in railway signaling and control systems where reliable connections, vibration resistance, and high electrical integrity are crucial for safety and operational continuity. The disconnect feature can be used for section isolation or signal lamp testing.

Problem Solved

Ensures robust and reliable electrical connections in demanding railway environments, preventing failures due to vibration or temperature extremes. Facilitates safe testing and isolation of critical signaling circuits.

Railway applicationsVibration resistanceSignaling systemsControl circuits-60°C to 110°C6 kV surge voltageDisconnectDIN rail

3. Machine Building and Plant Engineering for Modular Systems

In modular machine designs or plant expansions, these disconnect terminal blocks facilitate easy and safe connection and disconnection of sub-assemblies or field devices. The wide wire cross-section range (0.14-6 mm²) accommodates various sensor, actuator, and power wiring requirements, while the screw connection provides secure termination.

Problem Solved

Simplifies the assembly, commissioning, and modification of complex machinery and industrial plants by providing flexible, reliable, and easily isolatable connection points. Accommodates diverse wiring needs within a single terminal block type.

Modular designMachine buildingPlant engineeringField devicesScrew connection0.14-6mm² conductor500V20ADIN rail