Fantini CosmiSwitches & Thermostats

Fantini Cosmi Immersion aquastat external adjustment 40/120°C C03B3

Fantini Cosmi Immersion aquastat 40/120°C C03B3

SKU 3G-CBM-03582

Also listed as: FAN 06306 · FAN-06306

Brand

Fantini Cosmi

Item

Immersion aquastat external adjustment 40/120°C C03B3

Local availability & support — Singapore

Local office: 20 Woodlands Link #09-05, Singapore 738733
Phone: +65 8878 8355
Delivery: Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment: Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to: Singapore

Technical Specifications

Fantini Cosmi

dimension a

8 mm 

dimension b

40 mm 

dimension c

85 mm 

dimension d

15 mm 

dimension e

10 mm 

dimension f

37 mm 

dimension g

4 mm 

contact type

Two directions microswitch of instant action with AGcdO contacts 

differential

6±1 K 

bulb material

Copper 

operation type

Liquid expansion function 

overall length

100 mm 

immersion depth

70 mm 

sensing element

Stainless steel diaphragm 

sheath material

Copper 

housing material

Shock-proof self-extinguishing thermoplastic material V0 

protection level

IP40 

sheath connection

GC 1/2 PN10 

temperature range

40–120 °C 

contact rating ac12

250 V~ 50 Hz, 15 A 

calibration accuracy

±3 °C 

standards compliance

EN 60947-5-1, EN 60730-1 

thermal gradient air

4 K/hour 

ispesl approval model

C03A3 

connection thread size

GC 1/2 PN10 

immersion bulb diameter

Ø8 mm 

thermal gradient liquid

1 K/hour 

maximum bulb temperature

150 °C 

connection pressure rating

PN10 

nominal continuous current

15 A 

nominal insulation voltage

380 V~ 

admissible body temperature

120 °C 

electrical connection cable gland

PVC cable gland 

operation on temperature increase

1-2 are opening, 1-4 are closing 

internal regulation version length

100 mm 

storage transport temperature range

-35 to 120 °C 

nominal operating current resistive load 220v

Not specified 

nominal operating current resistive load 250v

15 A 

nominal operating current resistive load 380v

10 A 

internal regulation version additional dimension

42 mm 

Datasheet Content

FAN06302 à 06
Immersion thermostats for direct mounting
Thermostats for direct mounting on the pipeline, supplied with special casing for immersion into the control-
led liquid. Suitable for boilers, heating systems, circulation pumps, burners, air heaters.




                                                                                                           21

                                                                                                                                   Ø8
                                                                                                      70




                                                                            Dimensions (mm)
                                                                                                      8              40                 85         15      10        37             4

                                                                                                                                             100




                            Temperature                     Differential                               Calibration                    Maximum                             Protection
                               range		                                                                  accuracy                  bulb temperature                          level
                                 °C                               K                                        °C                            °C
C03A3                           10 ÷ 90                         6±1                                             ±3                            150		                            IP40
C03B3                          40 ÷ 120                         6±1                                             ±3                            150		                            IP40

EXECUTION WITH INTERNAL REGULATION



                                                                                                                                     Ø8

                                                                                                  70




                                                                                Dimensions (mm)
                                                                                                  8                  40                      85           15    10
                                                                                                                                               100                             42




C03A3RI                         10 ÷ 90                         6±1                                             ±3                            150                              IP40
C03B3RI                        40 ÷ 120                         6±1                                             ±3                            150                              IP40
*The differential is subtracted from the range value. The differential values refer to a thermal gradient of 1K/hour in liquid and 4K/hour in air.



ELECTRICAL FEATURES
Two directions microswitch of instant action with AGcdO                        EXAMPLE OF ELECTRICAL connection
contacts.                                                                                                                                             N
                                                                              R
Contact parameters in compliance with EN 60730-1: 15(6)                       S
A 250V~ 50Hz.                                                                 T
                                                                                                                                                                           1
                                                                              N
Parameters in compliance with EN 60947-5-1:
Nominal insulation voltage: Ui 380V~.                                                                                     1 3 5 13
Nominal continuous current: Ith 15A.                                                                                                                                  2         4
                                                                                                                98   96                                                             R
                                                                                                                                                                                    R -- RICARICA
                                                                                                                                                                                          RESTART
Nominal operating current Ie       220V-               250V~      380V~                                                                                                             S
                                                                                                                                                                                    0 -- STOP
                                                                                                                                                                                         STOP
                                                                                                                                                               97         95
Resistive load            AC-12 -                      15A        10A                                                              14
                                                                                                                97   95
Inductive load            AC-15 -                      2,5A       1,5A                                                    2 4 6                                98         96
Direct current            DC-13 0,2A                   -          -                               4    2    1                                                             A2

                                                                                                                                                                          A1
                                                                                                                                              L
STANDARDS AND CERTIFICATES
Compliance with standards EN 60947-5-1, EN 60730-1.
ISPESL approval for C03A3.



INSTALLATION
Direct immersion mounting of the bulb through a threaded sheath GC 1/2 PN10 (included in the package).



OPERATION
When the temperature increases: 1-2 are opening, 1-4 are closing.
Liquid expansion function.



FEATURES
Sensing element with stainless steel diaphragm.
Copper bulb and capillary.
Cooper sheath with connection Gc 1/2 PN10.
base, cover and knob in shock-proof self-extinguishing thermoplastic material V0.
Electrical connection output with PVC cable gland.
Admissible body temperature: 120°C.
Storage and transport temperature: -35 ÷ 120°C.

Technical Documents

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Technical Document 1

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Fantini Cosmi Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Fantini Cosmi Immersion aquastat 40/120°C C03B3

Frequently Asked Questions

What is the Fantini Cosmi C03B3 immersion aquastat used for?

The Fantini Cosmi C03B3 immersion aquastat is used for temperature control in boilers, heating systems, circulation pumps, burners, and air heaters. It mounts directly on pipelines with a threaded sheath, making it suitable for industrial and commercial HVAC applications in Singapore.

What are the specifications of the Fantini Cosmi C03B3 immersion aquastat?

The C03B3 has a temperature range of 40 to 120 °C, a differential of 6±1 K, and a copper bulb with stainless steel diaphragm. It features a two-direction microswitch with AGcdO contacts rated 15(6) A at 250 V~, and a protection level of IP40. The sheath connection is GC 1/2 PN10.

Where to buy the Fantini Cosmi C03B3 immersion aquastat in Singapore?

3G Electric supplies the Fantini Cosmi C03B3 immersion aquastat to customers in Singapore. We handle logistics, customs clearance, and delivery to your site. Contact our team for pricing and lead time on this item.

How to install the Fantini Cosmi C03B3 immersion aquastat?

Install the C03B3 by mounting the bulb directly into the pipeline using the threaded sheath GC 1/2 PN10 included in the package. Ensure the sensing element is fully immersed in the controlled liquid. Follow standard wiring practices for the microswitch connections as per the datasheet.

Used in

Common applications for Fantini Cosmi

Oil-fired boiler burner control — Fantini Cosmi ambient thermostat C16I and pressure switch B12HNY for fuel-pump lockout and room-temperature feedback.

Pneumatic compressor load management — B12DN or B13CN pressure switch for unload-valve control and tank cutout in 5–150 bar air systems.

Hydronic heating-plant commissioning — B12GNY and B12CRNY switches for pump-discharge and low-pressure monitoring in chilled-water and hot-water loops.

Industrial steam and hot-water vessel safety — B12HNY high-pressure switch and A96D/A95B level regulators for water-level and overpressure interlocks.

Thermal-storage tank management — A95B and A96D liquid-level regulators with 15-meter cable reach for boiler-makeup and expansion-tank applications.

Portable pump and pressure-test equipment — B12DN with adjustable differential for mobile hydraulic-circuit monitoring and component proof-pressure validation.

Fantini Cosmi Products

3G Electric supplies Fantini Cosmi switches & thermostats. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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