Output Terminal Block for Digital Output Modules

Product Specifications

Technical details and manufacturing context for Output Terminal Block

Definition

An output terminal block is a component used within a digital output module in industrial control systems. It provides a secure and organized electrical connection point for wiring external field devices, such as actuators, solenoids, indicators, or relays, to the module's output channels. This terminal block serves as the physical interface where the module's low-voltage control signals are transferred to the higher-power circuits of the connected machinery or equipment. It is designed to ensure reliable signal transmission while offering a convenient point for testing, isolation, and maintenance. The terminal block typically features screw terminals or spring-clamp connections, accommodating wire cross-sections from 0.2 to 4 mm². It is rated for a control voltage of 24 V DC and a current range of 2 to 10 A per channel, depending on the terminal size. Contact resistance is kept at or below 5 mΩ to minimize power loss and heating. Insulation resistance is at least 1000 MΩ at 500 V DC, and dielectric strength withstands 2.5 kV for one minute without breakdown. The operating temperature range is -40 to 85 °C, suitable for industrial environments. The housing offers IP20 finger-safe protection for cabinet installation. The clamping mechanism is made of steel, contacts are copper alloy, and the housing is thermoplastic with a UL94 V-0 flammability rating. Tightening torque for screw terminals is 0.5 to 0.8 N·m. Each terminal block weighs between 15 and 30 grams, affecting panel layout. These specifications are typical reference values; always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The output terminal block receives low-voltage digital signals from the output module's internal circuitry via its input side. It provides screw terminals or spring-clamp connection points where external wires are secured. This creates a reliable electrical path, allowing the control signal to pass from the module to the connected load without signal degradation. The terminal block also provides a point for isolation, testing, and maintenance, enabling technicians to disconnect or measure signals safely. The clamping mechanism ensures a secure connection, while the contact material minimizes resistance and heat generation.

Common Materials

Copper alloy (contacts), Thermoplastic (housing), Steel (clamping mechanism)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Voltage	24 V DC	Standard control voltage for industrial digital outputsIEC 60947-7-1
Rated Current	2–10 A	Per channel; higher current requires larger terminalIEC 60947-7-1
Contact Resistance	≤5 mΩ	Lower resistance reduces power loss and heatingIEC 60947-7-1
Insulation Resistance	≥1000 MΩ	Measured at 500 V DC; ensures safetyIEC 60243-1
Dielectric Strength	2.5 kV	Withstands 2.5 kV for 1 minute without breakdownIEC 60243-1
Operating Temperature	-40–85 °C	Extended range for industrial environmentsIEC 60068-2-1/2
Ingress Protection	IP20	Finger-safe; for cabinet installationIEC 60529
Wire Cross-Section	0.2–4 mm²	Acceptable solid or stranded wire rangeIEC 60947-7-1
Tightening Torque	0.5–0.8 N·m	Ensure reliable connection without damageIEC 60947-7-1
Flammability Rating	UL94 V-0	Self-extinguishing within 10 secondsUL 94
Weight	15–30 g	Per terminal block; affects panel layout

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Terminal Housing
Insulates and protects the conductive elements, provides mounting structure, and ensures user safety.

Material: Thermoplastic (e.g., PA, PBT)
Contact / Conductor Part
Provides the electrical path for the signal/current from the module's internal circuit to the external wire.

Material: Copper alloy (e.g., brass, phosphor bronze), often tin-plated
Clamping Mechanism
Secures the inserted wire to the contact point, ensuring a reliable, gas-tight electrical connection.

Material: Steel (screw) or special spring steel alloy (spring clamp)
Marking Area / Label Carrier Part
Provides a surface for identifying the terminal (e.g., channel number) for easy wiring and maintenance.

Material: Thermoplastic or paper/plastic insert

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Digital Output Module

View system integration details

Manufacturers of Output Terminal Block

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Frequently Asked Questions

What is the rated voltage and current of this output terminal block?

The rated voltage is 24 V DC, and the rated current is 2 to 10 A per channel, depending on the terminal size. These values are typical reference ranges; always confirm the specific model's ratings with the manufacturer.

What wire sizes can be connected to this terminal block?

The terminal block accepts solid or stranded wires with a cross-section of 0.2 to 4 mm². Ensure the wire is properly stripped and tightened to the specified torque of 0.5 to 0.8 N·m for reliable connection.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, making it suitable for industrial environments. Verify that the application's ambient temperature stays within this range to ensure reliable performance.

What standards does this terminal block reference?

The terminal block references IEC 60947-7-1 for electrical ratings, IEC 60243-1 for insulation and dielectric strength, IEC 60068-2-1/2 for temperature, IEC 60529 for IP rating, and UL 94 for flammability. These standards are verification references; the manufacturer must confirm compliance for the specific product.

Data Basis

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Preliminary Technical Classification

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current:	Up to 10A per terminal
voltage:	Up to 300V AC/DC
temperature:	-40°C to +85°C

Output Terminal Block

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

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