MBC5100-5251-1CB04 Danfoss Pressure Switch 061B510066 16-160 bar

Product Overview

The MBC5100-5251-1CB04 (Material No. 061B510066) is a high-range model from Danfoss’ MBC 5100 series of heavy-duty pressure switches. This series features a compact block design specifically engineered for industrial and marine applications where space constraints and reliability requirements are most critical.

The MBC 5100 pressure switch converts system pressure signals into electrical switching signals for alarm indication, system shutdown, pressure control, and diagnostics. Its pressure sensing element utilizes a piston-type design, making it suitable for precise pressure monitoring in medium-to-high pressure ranges. The adjustment screw provides a 7% change per full 360° rotation of the setting range, enabling intuitive and convenient on-site pressure setting.

MBC pressure switches are a core component of the Danfoss Block System, working alongside MBS pressure transmitters and MBV test valves to form a comprehensive pressure monitoring and control solution.

As a direct replacement solution for the Danfoss MBC 5100 series, this product strictly complies with Danfoss MBC 5000 / MBC 5100 technical data sheet standards and offers complete interchangeability—direct drop-in replacement without any modification to mounting dimensions or piping 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 

MBC5100-5251-1CB04 (061B510066)

• Model: MBC5100-5251-1CB04

• Material Number: 061B510066

• Product Series: MBC 5100

• Product Type: Heavy Duty Pressure Switch

• Regulation Range (Pe) : 16 – 160 bar

• Max. Working Pressure: 600 bar

• Max. Test Pressure: 600 bar

• Burst Pressure: 1200 bar

• Differential (Fixed) : 30 bar @ Max. range setting / 15 bar @ Min. range setting

• Pressure Sensing Element: Piston type

• Pressure Connection Type: G thread (per ISO 228-1)

• Pressure Connection Size: G 1/4″ female

• Electrical Connection: DIN-plug, Pg 11, per EN 175301-803-A

• Contact Function: SPDT (Single Pole Double Throw)

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

• Enclosure Rating: IP65

• Ambient Temperature Range: -40 °C to +85 °C

• Reset Function: Automatic (Auto)

• Housing Material: Anodized AlMgSi1 (AW-6082T6)

• Net Weight: 0.257 kg

• Gross Weight: 0.307 kg

• Electrical Standard: EN 60947-5

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

• EAN Code: 5702423212743

Key Technical Advantages

1. Modular Block Design – Engineered for Harsh Conditions
The MBC series features Danfoss’ unique 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. High Vibration Resistance & Comprehensive Marine Approvals
The MBC 5100 series offers exceptional vibration stability and 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 is the core competitive advantage distinguishing MBC 5100 from comparable products, making it the preferred choice for pressure switches in marine and offshore applications.

3. Fixed Low Differential – Ensuring Accurate Monitoring
The MBC series features a fixed differential design, with the differential value factory-set and unaffected by on-site adjustments. This ensures that repeatability remains consistent across the entire setting range—typical repeatability of the upper switch point is ±0.1 bar—delivering precise and reliable monitoring of critical pressures.

4. Piston-Type Sensing Element – Optimized for Medium-to-High Pressure
This model (061B510066) employs a piston-type pressure sensing element. Compared to bellows-type elements, the piston design offers superior pressure resistance and shock tolerance, making it particularly suitable for precise pressure monitoring in the 16–160 bar medium-to-high pressure range. The piston design also provides enhanced long-term stability and wear resistance, significantly extending product service life.

5. Anodized Aluminum Housing – Superior Corrosion Resistance
The housing is manufactured from anodized AlMgSi1 (AW-6082T6) aluminum alloy, offering excellent resistance to saltwater corrosion and industrial atmospheric corrosion. Combined with the IP65 enclosure rating, this ensures long-term reliable operation in harsh environments involving moisture, salt spray, and dust.

6. 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.

Application Areas

• Marine & Offshore Engineering: Pressure monitoring and alarm for main engines, gearboxes, thrusters, steering gears, ballast systems, and fire-fighting systems

• Industrial Hydraulic Systems: Hydraulic power units, filter clogging alarm, accumulator pressure monitoring

• Compressed Air Systems: Compressor discharge pressure control and safety shutdown

• Refrigeration & Air Conditioning Systems: Refrigerant pressure monitoring and system protection

• Water Treatment & Supply Systems: Pump discharge pressure control and low-pressure alarm

• Construction Machinery & Mining Equipment: Hydraulic system pressure safety monitoring

• Power Generation Equipment: Lube oil pressure and cooling water pressure monitoring and alarm

Expert Maintenance Tips

1. Mounting Orientation & Location
The MBC pressure switch is not sensitive to mounting orientation; however, it is recommended to install the unit with the electrical connection pointing downward or horizontally to prevent condensate or oil from accumulating at the DIN connector, which could affect electrical connection reliability. The installation location should be as far as possible from strong vibration sources, or vibration isolation measures should be employed.

2. Pressure Setting Procedure
When adjusting the set point, use a dedicated adjustment tool and rotate the setting screw slowly. One full turn (360°) corresponds to approximately 7% of the setting range. It is recommended to perform final setpoint calibration under actual system operating pressure 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 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 pressure switch every 6 months or during each major system overhaul:

• Slowly increase system pressure and verify switch actuation at the set point

• Slowly decrease system pressure and verify switch reset at the reset point (automatic reset function)

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

• Inspect pressure connection for any leakage

5. Installation Torque Specification
For the pressure connection (G 1/4″ female), a tightening torque of 20–25 N·m is recommended. Apply an appropriate amount of thread sealant or use a sealing washer prior to installation to ensure reliable sealing without damaging the threads.