Model SW1 can switch between superconducting and normal state using the integrated heater. It can be used in low current superconducting circuits such as pickup loops in SQUID-based magnetometers or SQUID input circuits for various detectors. It is successfully being applied in low field MRI (magneto resonance imaging) applications all over the world.

The model SW1 has an Nb-based thin film bifilar switching element with low inductance and an integrated heater. The switching time is as low as few microseconds. The customer can select from two switch versions on every chip.

Model SW1 is hermetically sealed inside a glass fiber package. It has solder terminals with normal metal wire bond connections to the heaters and Nb terminals with screws for true superconducting connection to the switching element.  

Parameter	Value
Chip size in mm	2.5×2.5
Working temperature in K	< 5
Switching time to superconducting state in µs	< 5
Switching time to resistive state in µs	< 10
Nominal heater current in mA	10

Switch parameters available (tolerance 15%)  

Parameter	Value
Switch resistance in Ohm	480	240	120	100	50	25
Heater resistance in Ohm	240	120	60	180	120	60

SQUID sensor models CE1blue and CE2blue are available in a compact package combining SQUID sensor and superconducting switch model SW1.