Thermorex TK34R

Name: Thermorex TK34R
Brand: Thermorex
SKU: TK34R
Availability: InStock

Bimetallic temperature sensitive switch or cyclic operation device with automatic reset control.

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TK34R

Thermostats

-25…120 °C

Operating range

Contact types

Terminals

Mountings

This device is operating with a resistance based internal heater. Further variations of this device are the TK34A with the automatic reset option, and TK34M with the manual reset option. Besides its variety of standard configurations the thermostat can also be customized to Your specific technical needs, assuring maximum design flexibility and usage in broad range of temperature control applications for consumer, industrial and commercial products.

Application	Note
This thermostat is widely used in a broad range of temperature control applications for consumer, industrial and commercial products.	Besides its variety of standard configurations the thermostat can also be customized to the specific technical needs of the customer.

TK34-R-T01-MG01-B3P

01 / 01

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Datasheet Technical specifications

General parameters

Parameter	Value
Rated voltage, V, not more	~250
Rated current, A, at power coeff. 0.95, not more	16
Maximum current, A, at power coeff. 0,95, not more	25
Number of automatic cycles, at rated current 25 A and power coeff. 0.95, not less than	100000
Operating temperature, °C	-25°C — 120°C
Tolerance of operating temperature, °C	±3; ±5
Transient resistance, Ω, not more	0.05
Contact operating time, ms, not more	3
Electric strength of insulation, V, not less than	1500
Insulation resistance, MΩ, not less than	50
Heating speed, K/min	minimum-0.1, maximum-1.0
Degrees of protection provided by enclosure	IP4X

Why it costs more than €1

Certified, not just claimed

A commodity thermostat optimises for unit price. This one optimises for a predictable, documented failure mode — the entire point of a protective component.

Genuine approvals

ENEC, VDE, IEC/IECEE, EAC and UKAS with verifiable certificate numbers — not the counterfeit marks common at the bottom of the market.

Factory-calibrated

Built to your exact trip temperature within the rated tolerance, not limited to a handful of fixed catalogue set points.

Documented cycle life

Rated 30,000–100,000 cycles at load with lot traceability — a specified, repeatable failure mode, not a guess.

Configurable

Body, terminal, mounting and contact type built to order, so the device drops into your design instead of forcing a compromise.

Configurable Build to order

Available Configurations

Temperature Ranges

-25–120 °C3–5 °C

Terminal Types

T01T02

Mounting Options

MG01MG02

Contact Types

CT1 (NC) (1)CT2 (NO) (2)

Cross-reference

Compare with related thermostats

Not sure this is the right model? These families share the platform and cover adjacent temperature, current and reset requirements.

-45…200 °C

TK24

1/2" bimetal switch that responds to temperature rise or fall used to maintain a desired temperature between two designated values.

200…425 °C

TK24HT

1/2" bimetal switch for high temperatures used to maintain a desired temperature between two designated values.

30…250 °C

TK32

1/2" bimetal temperature limiter with manual reset which is dedicated to prevent overheating disconnecting the circuit.

30…250 °C

TK32OS

One-shot 1/2" bimetal temperature limiter which is dedicated to prevent overheating disconnecting the circuit.This is device is working as thermal fuse.

-40…170 °C

TK77DC

3/4" bimetallic thermostat that responds to temperature rise or fall used to maintain a desired temperature between two designated values.Dedicated for switching DC load.

30…190 °C

TK124

Bimetallic temperature sensitive switch or cyclic operation device with automatic reset control - blade thermostat.

30…200 °C

TK127

Bimetallic temperature sensitive switch with 12,7 mm size with automatic reset control. Ceramic body miniature thermostat.

-25…190 °C

TK224

3/4" bimetal two-pole switch that responds to temperature rise or fall used to maintain a desired temperature between two designated values switching automatically on off 2 pole of electrical circuit.

50…190 °C

TK232

3/4" bimetal two-pole thermal limiter that responds to temperature rise used to prevent for overheating device. This temperature sensitive element automatically switching off 2 pole of electrical circuit.It is not self regulating - requiring manual reset for safety reasons.

-45…250 °C

TKP

Adjustable thermostat TKP family is a temperature-sensitive switch that controling set temperature by automatically switching the power supply on or off. This is dedicated to heating and colling systems withvarious if options.

-45…250 °C

TKPCS

Adjustable thermostat TKP family is a temperature-sensitive switch current sensitive that controling set temperature by automatically switching the power supply on or off. This is dedicated to heating and colling systems with various if options and it can be used also as regulator of energy.

-25…120 °C

TK34A

3/4" bimetal switch that responds to temperature rise or fall used to maintain a desired temperature between two designated values switching automatically on off of electrical circuit. This thermostat can be used in high current applications (up to 45A )

50…120 °C

TK34M

3/4" bimetal thermal limiter that keeping to temperature under set value preventing for overheating the circuit. After actuation it is required to manual reset.This thermostat can be used in high current applications (up to 45A )

-30…180 °C

TK-AA-01

Bimetal hermetic temperature sensitive switch or cyclic operation device with automatic reset control

-30…180 °C

TK-AA-02

Bimetallic temperature sensitive switch or cyclic operation device with automatic reset control

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From the technical library

Related reading

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Certified vs Counterfeit: The True Cost of a €1 Thermostat

A commodity KSD301-class thermostat optimises for unit price; a certified device optimises for a predictable, documented failure mode — the entire point of a protective component. This guide breaks down where the savings come from, why counterfeit certification marks are widespread at the bottom of the market, how to verify a mark against the certifying body's register, and how to migrate from a commodity part to a certified, factory-calibrated equivalent such as the TK24, TK77DC, or TK224.

TK24 or TK24HT

TK24 is a versatile ½-inch thermostat that handles higher currents (16 A/10 A) up to 200 °C, with contacts configurable to open or close on temperature rise and IP64 sealing when required. TK24HT trades current capacity for extreme-temperature endurance, surviving to 425 °C with a fixed “opens-on-heat” contact scheme, ±6 °C tolerance and IP4X protection. In short: choose TK24 for mainstream 200 °C duty with better sealing, and TK24HT for high-heat safety cut-outs where lower current is acceptable.

Parameters overview

This reference piece walks through 14 critical parameters—rated voltage/current, temperature range and hysteresis, cycle life, insulation strength, IP rating, power factor, and reset style—that govern a bimetal thermostat’s safety, accuracy, and longevity. Each parameter is defined, its design impact explained, and typical values given (e.g., ≤250 V, 100 000 cycles, ±3 °C tolerance). Taken together, the list serves as a designer’s checklist for matching a thermostat to demanding consumer or industrial applications.

TK32 or TK32OS

Both TK32 limiters break the circuit between 30 °C and 250 °C, but TK32 resets manually after cooling while TK32OS is a one-shot device that stays open permanently. TK32 therefore suits equipment that a technician can inspect and re-activate, whereas TK32OS guarantees a non-restartable shutdown in fire-safety, medical, or chemical systems. Accuracy is similar (±3 °C/±6 °C), so the decisive factor is whether the application must allow or forbid reset.

Variants of TK34

The TK34 family shares a bimetal disc core and full customisation, yet differs in reset mode and current rating: TK34A is automatic-reset and carries up to 45 A; TK34R adds an internal heater for faster, targeted switching up to 25 A; TK34M requires a manual reset and handles 40 A for safety-critical scenarios. All models cover roughly –25 °C…120 °C and exceed 100 000 cycles at moderate loads, making them drop-in solutions from consumer heaters to industrial motors. Selecting the variant is essentially a trade-off between hands-off convenience, response speed, and the need for operator inspection.

TKP or TKPCS

TKP and TKPCS are shaft-adjustable, automatically reset thermostats rated up to 16 A and 250 VAC, but TKP offers finer tolerances (±3 °C…±10 °C), reset offsets from 5 °C to 15 °C, and operation down to –45 °C. TKPCS adds current sensitivity, uses dual “Low/High” tolerance bands (±20 °C/±10 °C) with a fixed 15 °C reset, and has higher contact resistance (0.15 Ω) that is acceptable in power-regulation roles. Engineers pick TKP when tight thermal control or sub-zero service is paramount, and TKPCS when load-dependent trip behaviour and simpler calibration are more valuable.

Frequently Asked Questions

What does the internal resistance heater in the TK34R do?

The resistance-based internal heater adds a precisely controlled amount of heat directly to the bimetal element, allowing the thermostat to trip at a lower ambient temperature than it would without the heater. This enables fine-tuned, application-specific trip points that are not achievable with standard bimetal thermostats alone.

How does the internal heater improve switching response?

What is the maximum current rating of the TK34R?

In which applications is precise trip timing most important?

How does the TK34R differ from the TK34A?