Square D Digest 179

SE Relays Power Relays Refer to Catalog 8501CT1003

General Purpose Relays

www.se.com/us

Table 20.42: Contact Ratings and Electrical Endurance (per IEC 609471, 6094741) Contact Ratings Load Voltage Frequency LoadType See Note(s)

Estimated Electrical Endurance

ACLoad 40A

50,000 cycles 50,000 cycles 20,000 cycles 100,000 cycles

[27][28] [29][28] [28][30]

300V

Resistive

2hp 15A A600

50/60Hz

120–600V

Motor

Tungsten Pilot Duty

120V

[28]

—

—

DCLoad 40A

28V 110V 220V 325V 500V

20A

100,000 cycles

[28]

8A 4A 2A

DC

Resistive

Dimensions, in, (mm)

2.06 (52.4)

1.874 (47.60)

0.81 (20.7)

0.19 (4.8)

0.374 (9.50)

0.31 (8.0)

2.5 (63.6)

2.49 (63.2)

1.15 (29.3)

SPDT—Short Base (shown with optional Auxiliary Switch)

1.98 (50.3)

1.874 (47.60)

2.49 (63.2)

2.5 (63.6)

SPST-NO-DM

2.31 (58.8)

0.19 (4.8)

1.874 (47.60)

0.374 (9.50)

2.5 (63.6)

3.13 (79.4)

1.15 (29.3)

DPDT—Long Base (shown with optional Auxiliary Switch)

20 RELAYS AND TIMERS

Resistive AC load ratings are based on a power factor of 0.85–1.0.

[27]

[28] All ratings are based on applying the rated nominal power to the relay coil so as to provide a “clean” make and break that does not result in any contact chatter or multiple actuation of the contacts. [29] Motor horsepower ratings are based on a power factor of 0.4–0.5, and an initial inrush current not exceedin [30] The tungsten rating is based on cold-filament inrush current not exceeding 15 times the rated steady-state lamp current.

20-15

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