Brand: JUMO

JUMO 608301 Bimetal Temperature Switch with Fixed Setpoint

Name: JUMO 608301 Bimetal Temperature Switch | Seven Star LLC
Brand: JUMO
SKU: 608301

Description

Electromechanical temperature switch with a fixed switching temperature

The JUMO 608301 is an electromechanical bimetal temperature switch with a fixed switching temperature. In industry, such switches limit temperature: for example they switch a machine off in case of overheating or switch on a fan to cool the device. The series is free of cadmium and RoHS-compliant, and installation is simple.

Temperature is measured by a bimetal disc that snaps when the rated switching temperature is reached. After cooling to the switchback temperature the switch returns to its original state. The switchback temperature is typically 15 to 30 K below the switching temperature on the snap-action version.

The switch is supplied with an N/C contact that opens an electrical circuit, or an N/O contact that closes one when the switching temperature is reached. Three designs are offered: the snap-action switch (608301/10), the slow-action contact (608301/20) and the miniature snap-action switch (608301/30).

Fittings are made of brass CW614N or stainless steel 1.4305 and are sealed with a sealing ring in a screw-in spigot similar to DIN 3852 form A. Insertion lengths of 28, 35 and 40 mm are listed, with cable lengths of 1000 to 5000 mm where a cable version is ordered.

Technical specifications

Parameter	Specification
Type	608301/10 snap-action, /20 slow-action, /30 miniature snap-action
Switching temperature	0 to 140 °C (/10), 10 to 140 °C (/20), 60 to 140 °C (/30); order code 40 to 140 °C in 5 K steps
Switchback	About 15 to 30 K (/10), 3 to 12 K (/20) or 20 to 45 K (/30) below the switching temperature
Accuracy	+/-5 K up to 130 °C; +/-10 K above 130 °C (at 1 K/min)
Switching capacity /10	Up to AC 250 V, 10 A (cos phi 0.95); DC 30 V, 5 A; gold contact DC 6 to 30 V, 10 to 100 mA
Switching capacity /20	DC 12 V, 8 A; DC 24 V, 4 A; DC 30 V, 3 A; up to AC 48 V, 6 A
Switching capacity /30	Up to AC 250 V, 2.5 A (1.6 A at cos phi 0.6)
Protection type	IP52 (tab connector), IP65 (cable fitting, DIN socket), IP67 (attached cable, M12 plug)
Fitting	Brass CW614N or stainless steel 1.4305; G 1/2 or M14 x 1.5 screw-in spigot
Electrical connection	Tab connector A 6.3-0.8, attached cable, connecting cable with fitting, M12 x 1 plug, DIN EN 175301-803 socket
Response time	t0.9 about 3.5 min (/10), 3.0 min (/20), 1.5 min (/30)
Dielectric strength	AC 1500 V for 1 minute
Vibration	10 g (50 Hz, +/-0.75 mm); /30 tested 10 to 1000 Hz
Weight	About 50 g

Order code and options

The order code runs: basic type 608301, extension (10, 20, 30), switching temperature, switching output (98 for N/C, 99 for N/O), nominal voltage code, electrical connection, process connection material, diameter, thread, insertion length, cable length and extra code. An example is 608301/10-140-98-50-01-50-10-121-35-0/000.

Extra codes add a snap-action contact with gold plating (702), an integrated Pt100 (840) or an integrated Pt1000 (841). The data sheet states a minimum order quantity of 50 pieces and that other versions of switching temperature and fitting are available on request, so ask us about availability for your quantity.

Nominal voltage codes include AC 6 to 48 V, AC 6 to 230 V, DC 12 to 30 V for the slow-action contact and gold-plated versions for DC 6 to 30 V or AC 6 to 120 V, which suit low-current signal circuits.

Switching cycles in the data sheet are 100,000 or more at AC 250 V, 10 A and at AC 48 V, 15 A for the snap-action switch, and at least 10,000 at DC 5 A loads from 6 to 30 V. Operate within these ratings for the stated life, and use the gold-plated contact for low-level signals between 10 and 100 mA.

The maximum current carrying capacity depends on the ambient temperature at the wire: for the attached cable version it is 10 A up to 50 °C, 7.3 A up to 75 °C and 4.2 A up to 85 °C. Choose a connection type whose cable can handle the temperature at your installation.

Applications

Typical uses are overtemperature cut-outs on machines, motors, hydraulic oil circuits and heat exchangers, and fan switching for cooling. A fixed-point switch is cheap and compact, and the screw-in fitting places the bimetal disc directly in the measured medium or a drilled boss.

Select the contact type for the load. The standard snap-action switch handles higher currents, the slow-action contact has a narrow differential for control tasks and the miniature version suits small signal loads. Check the specified current against the connection type, because the permitted current falls as the cable temperature rises.

Dimension drawings in the data sheet show the G 1/2 version with a 28 mm or 35 mm insertion length and the M14 x 1.5 version, with a wrench size of 28 mm or 35 mm. Plan the mounting boss accordingly and use a new sealing ring after each removal.

For the M12 plug versions the contact is connected through terminals 1 and 2 of the mating connector, and the IP67 rating applies only with the mating connector fitted and tightened.

Documents and quotation

Download the data sheet (JUMO 608301 data sheet (EN, 12 pages)) from the attachment on this page. To request a quotation, give us the complete order code from the data sheet and your quantity, and we will come back with stock status and lead time. More products of this kind are collected in Temperature Instrumentation.

Datasheets & Documents

Datasheet JUMO 608301 data sheet (EN, 12 pages) Download

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About brand

JUMO is the German maker of temperature sensors, process controllers, pressure transmitters and liquid analysis instruments. Moritz Kurt Juchheim founded it in Fulda in 1948 as M. K. Juchheim KG, making glass thermometers with six employees. The name JUMO comes from the founder's name. It is still a family company headquartered in Fulda, and the parent company has been called JUMO GmbH & Co. KG since 2003.

Seven Star LLC is an independent supplier in Muscat. We list JUMO RTD and thermocouple probes, thermowells, transmitters, controllers, recorders and water analysis instruments, and supply them to process plants, OEMs, HVAC contractors and water utilities in Oman and the GCC by type number.

JUMO company profile

Established	1948, Fulda, Germany, by Moritz Kurt Juchheim
First products	Glass and contact thermometers; platinum glass sensors from 1966
Ownership	Family-owned; renamed JUMO GmbH & Co. KG in 2003
Product families	RTD and thermocouple probes, thermowells, temperature and pressure transmitters, controllers and thermostats, safety temperature limiters, paperless recorders, liquid analysis and flow and level instruments

Milestones

1948: Moritz Kurt Juchheim founds M. K. Juchheim KG in Fulda, making glass thermometers with six employees.
1966: Platinum glass temperature sensors are added.
2003: The parent company is renamed JUMO GmbH & Co. KG.

JUMO products we list

Family	Models	Typical use
RTD and thermocouple probes	902020, 902030, 902050, 902120, 902006 2xPt100, PROCESStemp, mineral-insulated RTD, 901020 thermocouple, 901210, 902810 hygienic, 902550 surface, 902520 HVAC, MarineTemp	Temperature measurement in pipes, vessels, machines, HVAC and food plants
Thermowells and inserts	909710 thermowells, 909740 measuring inserts	Protecting sensors and replacing them without opening the process
Temperature transmitters	dTRANS T01, T03, T04, T05, T06 SIL, T07 HART, T09, T1000 IO-Link, DELOS T switch	Converting sensor signals to 4-20 mA, HART or IO-Link
Pressure and level	dTRANS p20, p30, p31 hygienic, p33 Ex, p02 DELTA, MIDAS S05, MIDAS DP10, DELOS S02, MAERA S25, NESOS R20	Pressure in process, hydraulic and OEM systems; tank and well level
Controllers, limiters and recorders	DICON touch, IMAGO 500, dTRON 316, iTRON, cTRON, diraTRON 104, eTRON T, safetyM STB/STW, safetyM TB/TW, LOGOSCREEN 601, mTRON T	Furnace, oven and process control, over-temperature protection and recording
Liquid analysis and flow	AQUIS touch S, AQUIS touch P, AQUIS 500 pH, AQUIS 500 CR, dTRANS pH 02, pH electrode, digiLine DO, ecoLine NTU, flowTRANS MAG H20, flowTRANS US W01	pH, conductivity, oxygen and turbidity in water treatment; liquid flow

Choosing a temperature sensor starts with the range and accuracy. A Pt100 RTD is accurate and stable from about -200 to 600 °C and is the usual choice in process plants. A thermocouple (type K or J, for example) covers much higher temperatures and responds faster but is less accurate. The wiring also matters: a 3-wire or 4-wire Pt100 connection cancels the resistance of the cable, while a 2-wire connection adds an error that grows with cable length. That is why a head-mounted transmitter is often fitted close to the sensor.

Where JUMO products are used

In Oman and the GCC, JUMO sensors and controllers are used in oil and gas and chemical plants, food and beverage production, plastics and metal heat treatment, HVAC and district cooling, water and wastewater treatment, swimming pools and marine applications.

Ordering JUMO products: what we need

Send the JUMO type number and the full order code from the label (for example 902020/10-...). For probes, add the sensor type (Pt100, Pt1000, type K or J), the number of wires, the insertion length and diameter, and the process connection. For controllers, add the input, outputs and supply voltage.

Facts checked against JUMO's company history, October 2026.

Browse JUMO products by category: Temperature Instrumentation, Pressure Instrumentation, Liquid Analysis Sensors, Controllers & Data Acquisition, Level Transmitter.