MBC8100-2211-1A00075 Danfoss Temperature Switch 061B800366 50-100°C

Product Overview

The MBC8100-2211-1A00075 (Material No. 061B800366) is a modular temperature switch (thermostat) from Danfoss’ MBC 8100 series. This series is specifically designed for severe industrial and marine applications where compact space and operational reliability are the most critical requirements.

The MBC 8100 temperature switch converts temperature signals into electrical switching signals for temperature alarming, system shutdown, temperature control, and diagnostics. Its sensing element features a rigid sensor (Ø13 × 50 mm) that can be directly inserted into standard thermowells on process piping or equipment, delivering precise and reliable temperature monitoring.

MBC temperature switches are a core component of Danfoss’ modular block system, designed to withstand high vibration and extreme temperatures in harsh environments such as ship engine rooms. The MBC 8100 series holds all major international marine approvals, making it the preferred solution for temperature monitoring and control in marine and offshore applications.

As a direct replacement solution for the Danfoss MBC 8100 series, this product strictly complies with Danfoss MBC 8000 / MBC 8100 technical standards and offers complete interchangeability—direct drop-in replacement without any modification to mounting dimensions or electrical connections. Every unit undergoes 100% simulated duty cycle testing prior to shipment, ensuring performance reliability and long-term operational stability under actual working conditions.

Technical Specifications (Bulleted List)

MBC8100-2211-1A00075 (061B800366)

• Model: MBC8100-2211-1A00075

• Material Number: 061B800366

• Product Series: MBC 8100

• Product Type: Temperature Switch / Thermostat

• Temperature Range: 50 – 100 °C

• Max. Sensor Temperature: 200 °C

• Ambient Temperature Range: -40 °C to +70 °C

• Differential (Fixed) : 4 K

• Reset Function: Automatic

• Contact Function: SPDT (Single Pole Double Throw)

• Contact Rating: AC15 = 0.5 A, 250 V / DC13 = 12 W, 125 V

• Sensor Type: Rigid Sensor

• Sensor Dimensions (Ø × L) : 13 × 50 mm

• Min. Sensor Well Length: 75 mm

• Connection to Well/Piping: M 18 × 1.5

• Electrical Connection: DIN plug, Pg 11

• Electrical Connection Standard: EN 175301-803-A

• Electrical Specification Standard: EN 60947-5

• Enclosure Rating: IP65

• Housing Material: Anodized aluminum (modular block design)

• Charge Type: Adsorption

• Net Weight: 0.218 kg

• Gross Weight: 0.622 kg

• EAN Code: 5702423232833

• Approvals: ABS, BV, CCC, CCS, CE, DNV, EAC, GL, KRS, LR, LVD, NKK, RINA, RMRS, RoHS

• Packaging Quantity: 6 pc

Key Technical Advantages

1. Modular Block Design – Engineered for Harsh Conditions
The MBC 8100 series features Danfoss’ unique modular block design, delivering exceptional compactness specifically for space-constrained, high-vibration, severe-environment applications such as ship engine rooms. This design not only saves valuable installation space but also ensures long-term reliability under continuous high-vibration conditions.

2. Comprehensive International Marine Approvals
The MBC 8100 series holds full certifications from virtually all major classification societies worldwide, including: DNV GL, LR (Lloyd’s Register), ABS (American Bureau of Shipping), BV (Bureau Veritas), RINA, NKK (Nippon Kaiji Kyokai), KR (Korean Register), and CCS (China Classification Society) . This core competitive advantage makes MBC 8100 the preferred choice for temperature switches in marine and offshore applications.

3. Rigid Sensor Design – Fast Response & Easy Installation
This model (061B800366) is equipped with a rigid sensor (Ø13 × 50 mm) that can be directly inserted into standard thermowells. Compared to remote bulb types, the rigid sensor offers faster thermal response and simpler installation—no capillary tube routing required—making it particularly suitable for applications with compact installation spaces where the sensor and switch body are in close proximity.

4. Fixed Differential – Ensuring Accurate Monitoring
The MBC series features a fixed differential design, with the differential value factory-set (4K) and unaffected by on-site adjustments. This ensures that repeatability remains consistent across the entire setting range, delivering precise and reliable monitoring of critical temperatures.

5. SPDT Contacts & Flexible Electrical Connection
Equipped with SPDT (Single Pole Double Throw) contacts, the switch can be used in either normally open (NO) or normally closed (NC) control circuits to accommodate various control logic requirements. The electrical connection uses a standard DIN plug (Pg 11) per EN 175301-803-A, enabling fast, convenient, and reliable on-site wiring.

6. Anodized Aluminum Housing & IP65 Protection – Superior Corrosion Resistance
The housing is manufactured from anodized aluminum alloy with an IP65 enclosure rating, offering excellent resistance to saltwater corrosion and industrial atmospheric corrosion, ensuring long-term reliable operation in harsh environments involving moisture, salt spray, and dust.

Application Areas

• Marine & Offshore Engineering: Main engine cooling water temperature monitoring and alarm, gearbox oil temperature monitoring, bilge water temperature monitoring, fire-fighting system temperature control

• Diesel Generator Sets: High-temperature alarm and shutdown protection for engine cooling water and lube oil

• Industrial Refrigeration & Air Conditioning Systems: Refrigerant temperature monitoring, condenser temperature control

• Compressors & Power Stations: Compressor oil temperature monitoring, cooling system temperature control

• Factory Monitoring & Alarm Systems: Temperature monitoring and alarming for various process media

• Hydraulic Systems: Hydraulic oil temperature monitoring and cooling system control

• Heating & Hot Water Systems: Boiler outlet temperature control, hot water circulation system temperature monitoring

Expert Maintenance Tips

1. Sensor Installation Position
The rigid sensor must be fully inserted into the thermowell, ensuring the full sensor length (50 mm) makes good contact with the well. The minimum sensor well length is 75 mm. Fill the well with thermal conductive compound (e.g., thermal grease) to improve heat transfer efficiency and response speed.

2. Temperature Setting Procedure
When adjusting the set point, use a dedicated adjustment tool and rotate the setting screw slowly. It is recommended to perform final setpoint calibration under actual system operating temperature and verify the setting 2–3 times to ensure accuracy. Lock the locking nut firmly after setting.

3. Electrical Connection Precautions
Use a mating DIN connector compliant with EN 175301-803-A (Pg 11) for electrical connection. Before wiring, confirm that the supply voltage matches the contact ratings (AC15 0.5 A, 250 V / DC13 12 W, 125 V). Shielded cables are recommended to minimize electromagnetic interference affecting the switch signal.

4. Regular Functional Testing
It is recommended to perform functional testing of the temperature switch every 6 months or during each major system overhaul:

• Simulate temperature rise and verify switch actuation at the set point

• Simulate temperature drop and verify switch reset at the reset point (automatic reset function)

• Inspect DIN connector for loose, oxidized, or arced connections

• Inspect sensor and thermowell connection for damage or corrosion

5. Installation Torque Specification
For the sensor connection thread (M 18 × 1.5), apply appropriate tightening torque. Prior to installation, inspect the thread for damage and apply an appropriate amount of anti-seize compound to the thread to ensure reliable sealing and facilitate future maintenance disassembly.