What is the main function of this power contactor?
The Siemens 3RT2028-1BB40 is a power contactor designed for switching and controlling motors, as well as other electrical loads in industrial applications.
Does this contactor have a mirror contact?
Yes, the Siemens 3RT2028-1BB40 power contactor has a mirror contact according to IEC 60947-4-1.
Is this contactor positively driven?
No, the Siemens 3RT2028-1BB40 power contactor does not have positively driven operation according to IEC 60947-5-1.
What are the UL/CSA ratings for this contactor?
The Siemens 3RT2028-1BB40 power contactor has the following UL/CSA ratings: 3 hp at 110/120 V, 5 hp at 230 V for single-phase squirrel cage motors, and 10 hp at 200/208 V, 10 hp at 220/230 V, 25 hp at 460/480 V, and 25 hp at 575/600 V for three-phase squirrel cage motors.
What is the operating current (FLA) for three-phase squirrel cage motors?
The Siemens 3RT2028-1BB40 power contactor has an operating current (FLA) of 34 A at 480 V and 27 A at 600 V for three-phase squirrel cage motors.
What is the contact rating designation for auxiliary contacts?
The contact rating designation for auxiliary contacts of the Siemens 3RT2028-1BB40 power contactor is A600 / Q600 according to UL.
What is the B10 value for this contactor?
The B10 value for the Siemens 3RT2028-1BB40 power contactor with a high demand rate according to SN 31920 is 1,000,000.
What is the T1 value for proof test interval or service life?
The T1 value for proof test interval or service life of the Siemens 3RT2028-1BB40 power contactor according to IEC 61508 is 20 years.
What are the proportions of dangerous failures?
The Siemens 3RT2028-1BB40 power contactor has a proportion of dangerous failures of 40% with low demand rate and 73% with high demand rate according to SN 31920.
What is the failure rate (FIT value) with low demand rate?
The failure rate (FIT value) of the Siemens 3RT2028-1BB40 power contactor with low demand rate according to SN 31920 is 100 FIT.