公开(公告)号：US2654945A

公开(公告)日：1953-10-13

申请号：US5377448

申请日：1948-10-11

Applicant: CUTLER HAMMER INC

Inventor： RICHARDSON LINWOOD T ,  SWINEHART MERLE R

IPC: C22C32/00 ,  H01H1/023

CPC classification number: H01H1/023 ,  C22C32/0089

公开(公告)号：US3582982A

公开(公告)日：1971-06-01

申请号：US3582982D

申请日：1969-08-26

Applicant: CUTLER HAMMER INC

Inventor： SWINEHART MERLE R ,  GREINER RICHARD A

IPC: H02H3/06 ,  H02H3/093 ,  H02H5/00 ,  H02H3/08

CPC classification number: H02H3/093 ,  H02H3/06

Abstract: A solid-state differential amplifier system that trips out a relay when an overload condition occurs in a motor power supply circuit. An overload current sensing circuit provides a voltage proportional to the peak value of one or more overload conditions and includes a current avalanche device for protecting the following devices from excessive voltages. This voltage operates a timing circuit to provide a control voltage having an inverse time delay relative to the magnitude of the overload condition sensed. The control voltage upon reaching an ultimate trip value that is adjustable trips a differential amplifier to deenergize the overload relay. A diode-resistor circuit makes the tripping action regenerative once it is started for positive dropout of the overload relay. A constant current circuit supplies operating current to the differential amplifier. A voltage divider provides a voltage that normally biases the differential amplifier on to energize the overload relay and includes a potentiometer for adjusting the ultimate trip current value. The voltage divider supplies an operating voltage for the constant current circuit. An optional instantaneous trip circuit receives a reference voltage from the voltage divider circuit and functions to cause immediate tripping of the differential amplifier when the overload current exceeds a predetermined point above the ultimate trip value. The system provides time delayed automatic or manual reset as alternatives with minor modification.

公开(公告)号：US3475677A

公开(公告)日：1969-10-28

申请号：US3475677D

申请日：1967-07-31

Applicant: CUTLER HAMMER INC

Inventor： SWINEHART MERLE R ,  RICHTER WALTHER

IPC: G05D23/24 ,  G05F1/40 ,  G05F1/60 ,  H02P13/14

CPC classification number: G05D23/24 ,  G05D23/1906 ,  Y10S388/917 ,  Y10S388/933 ,  Y10S388/934

公开(公告)号：US3197658A

公开(公告)日：1965-07-27

申请号：US11271661

申请日：1961-05-25

Applicant: CUTLER HAMMER INC

Inventor： BYRNES RICHARD J ,  WALTHER RICHTER ,  SPINK ROBERT W ,  SWINEHART MERLE R

IPC: G01V3/10 ,  H03K17/95

CPC classification number: G01V3/107 ,  H03K17/9505 ,  H03K17/9525 ,  Y10T307/766

公开(公告)号：US3132225A

公开(公告)日：1964-05-05

申请号：US13348461

申请日：1961-08-23

Applicant: CUTLER HAMMER INC

Inventor： SWINEHART MERLE R

IPC: H01H9/38 ,  H01H9/44 ,  H01H50/54

CPC classification number: H01H9/38 ,  H01H9/443 ,  H01H50/54

公开(公告)号：US3059176A

公开(公告)日：1962-10-16

申请号：US76604558

申请日：1958-10-08

Applicant: CUTLER HAMMER INC

Inventor： WALTHER RICHTER ,  SWINEHART MERLE R

IPC: H01H11/00

CPC classification number: H01H11/0062

公开(公告)号：US2425052A

公开(公告)日：1947-08-05

申请号：US52560644

申请日：1944-03-08

Applicant: CUTLER HAMMER INC

Inventor： SWINEHART MERLE R

IPC: H01H1/0237

CPC classification number: H01H1/02374 ,  Y10S75/951 ,  Y10T29/49206