Connection Head / Terminal Block for Temperature Sensors

Product Specifications

Technical details and manufacturing context for Connection Head / Terminal Block

Definition

A connection head or terminal block is a critical component of temperature sensors that provides a secure, insulated housing for electrical connections between the sensor probe and external control or monitoring systems. It protects the sensor's internal wiring from environmental factors while ensuring reliable signal transmission. The connection head contains terminal blocks or screw terminals that mechanically secure and electrically connect the sensor's lead wires to external cables. It provides environmental protection (IP rating) and may include features for cable strain relief and electrical isolation. Typical materials include thermoplastic (PBT, PA66), stainless steel, and brass terminals. Key parameters include rated current (10–32 A), rated voltage (250–600 V), wire cross-section (0.2–2.5 mm²), number of poles (2–12), contact resistance (≤5 mΩ), insulation resistance (≥1000 MΩ at 500 V DC), dielectric strength (2.5–4 kV), operating temperature (-40–85 °C), ingress protection (IP20–IP65), housing material (PA66, UL 94 V-0), clamping torque (0.5–0.8 N·m), and weight (10–50 g). These values are reference ranges per IEC 60947-7-1 and IEC 60529; verify model-specific values with the manufacturer. The connection head is selected based on sensor type, cable entry, environmental conditions, and electrical requirements. It is essential for signal integrity and system reliability. Maintenance signals include loose connections, corrosion, or overheating. Failure boundaries include exceeding rated current or voltage, improper tightening torque, or exposure beyond IP rating. Always consult the manufacturer for specific application guidance.

Working Principle

The connection head provides a secure, insulated enclosure for electrical connections. Inside, terminal blocks or screw terminals mechanically clamp the sensor lead wires and external cables, creating a low-resistance electrical path. The housing protects against moisture, dust, and mechanical damage, with an IP rating indicating the level of protection. Strain relief prevents cable pull-out, and insulation resistance ensures signal integrity. Proper tightening torque (0.5–0.8 N·m) is critical to avoid overheating or loose connections. The design allows for easy wiring and maintenance while maintaining electrical isolation between terminals.

Common Materials

Thermoplastic (PBT, PA66), Stainless Steel, Brass Terminals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Current	10–32 A	Max current per terminal; exceeding may cause overheating.IEC 60947-7-1
Rated Voltage	250–600 V	Max voltage between adjacent terminals.IEC 60947-7-1
Wire Cross-Section	0.2–2.5 mm²	Acceptable solid or stranded wire range.IEC 60947-7-1
Number of Poles	2–12 poles	Number of terminal points per block.
Contact Resistance	≤5 mΩ	Lower is better for signal integrity.IEC 60947-7-1
Insulation Resistance	≥1000 MΩ	Measured at 500 V DC.IEC 60947-7-1
Dielectric Strength	2.5–4 kV	Withstands 1 min at this voltage.IEC 60947-7-1
Operating Temperature	-40–85 °C	Continuous operation range.IEC 60947-7-1
Ingress Protection	IP20–IP65	Higher IP for harsh environments.IEC 60529
Housing Material	PA66	Flame retardant V-0 grade.UL 94
Clamping Torque	0.5–0.8 N·m	Recommended tightening torque for screws.IEC 60947-7-1
Weight	10–50 g	Per block, varies with pole count.

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 Block
Provides electrical connection points with screw terminals or spring clamps

Material: Brass or Copper Alloy
Housing Part
Protects internal components from environmental factors

Material: Thermoplastic or Stainless Steel
Cable Gland
Secures and seals incoming cables

Material: Nylon or Brass
Cover Part
Encloses the terminal area for safety and protection

Material: Thermoplastic

Applied To / Applications

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

Temperature Sensors

View system integration details

Manufacturers of Connection Head / Terminal Block

Manufacturer profiles associated with Connection Head / Terminal Block.

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Frequently Asked Questions

What is the function of a connection head in a temperature sensor?

It provides a secure, insulated housing for electrical connections between the sensor probe and external wiring, protecting against environmental factors and ensuring reliable signal transmission.

What are typical materials used for connection heads?

Common materials include thermoplastic (PBT, PA66), stainless steel, and brass terminals. The housing material is often PA66 with UL 94 V-0 flame retardant rating.

What electrical parameters should be considered when selecting a connection head?

Key parameters include rated current (10–32 A), rated voltage (250–600 V), wire cross-section (0.2–2.5 mm²), contact resistance (≤5 mΩ), insulation resistance (≥1000 MΩ), and dielectric strength (2.5–4 kV). Verify with the manufacturer.

How does the IP rating affect the use of a connection head?

The IP rating indicates the level of protection against dust and water. Higher ratings (e.g., IP65) are suitable for harsh environments, while lower ratings (IP20) are for indoor use. Choose based on the application environment.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 10 bar
other spec:	IP67 ingress protection rating
temperature:	-40°C to +150°C

Connection Head / Terminal Block

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards