NUCLEAR QUALIFIED

EA740 Series Harsh Environment With Accident Conditions

Double pole double throw limit switches with cam type SNAP-LOCK technology, corrosion-resistant construction, and nuclear qualified connection options.

Ordering Information

Built for nuclear qualified service

The EA740 series combines dependable contact geometry, SNAP-LOCK cam action, and corrosion-resistant materials for harsh environments with accident conditions.

Double Pole Double Throw (DPDT)

Cam Type SNAP-LOCK Technology

Qualified to IEEE Standards 344-1975, 323-1974 and 382-1972

Manufactured to a quality assurance program for 10CFR50, Appendix B and ANSI N45.2

Diecast bronze housing for corrosion resistance

Stainless steel top cover and fasteners

Precision, Packed Into
Every Switch

Contact arrangementTwo normally open and two normally closed, NEMA form Z

EnclosureMeets NEMA 1, 4 and 13 requirements

Operating leverAdjustable in 7°30' increments through 360°

Wiring spaceAdequate wiring space for nine conductors

Operating temperature21° to 90°C; short term exposure to 175°C

Pre-travel18°

Maximum travel90°

Weight4.3 lbs.; 5.3 lbs with receptacle

DBE temperature340°F

DBE pressure70 PSIG

DBE radiation204 megarads gamma

Travel Data,
One Section at a Time

Travel values and torque values are shown as separate blocks so each operating condition reads like its own PDF section.

Lever condition

Standard Contacts

A. Trip Travel

18°

B. Reset Travel

14°

C. Recommended Travel

30°

D. Total Travel

90°

E. Torque to Trip

Lever condition

Maintained Contacts & Lever Position

A. Trip Travel

25°

55°

B. Reset Travel

25°

22°

C. Min. Travel to Maintain

54°

55°

D. Recommended Travel

60°

E. Total Travel

124°

116°

F. Overall Travel

56°

64°

G. Torque to Trip

Lever condition

Maintained Contacts - Lever Returned

A. Trip Travel

16°

30°

B. Reset Travel

30°

26°

C. Min. Travel to Maintain

26°

30°

D. Recommended Travel

45°

E. Total Travel

90°

F. Torque to Trip

16.5

To change switch orientation from cam position left view to cam position right view, separate switch then angle and reset at initial position.

Ordering Information

Build the part number
from the PDF

The groups below reflect the PDF ordering structure for mounting, rotation direction, and nuclear qualified connection options.

Group

A: Mounting

2 - Standard Mount

5 - Wide Mount

8 - Long Mount

Group

BC: Rotation Direction

00 - Clockwise or Counterclockwise

01 - Clockwise and Counterclockwise

60 - Maintained Contact & Lever Position

67 - Maintained Contact, Lever Returned

Group

DE: Nuclear Qualified Connection Option

00 - Open Conduit Entrance Clockwise or Maintained

01 - Open Conduit Entrance for Counterclockwise

40 - 9-Pin QDC Clockwise or Maintained

41 - 9-Pin QDC for Counterclockwise

50 - 4-Pin QDC 1NO/1NC Clockwise or Maintained

51 - 4-Pin QDC 1NO/1NC Counterclockwise

52 - 4-Pin QDC 2NO Clockwise or Maintained

53 - 4-Pin QDC 2NO Counterclockwise

54 - 4-Pin QDC 2NC Clockwise or Maintained

55 - 4-Pin QDC 2NC for Counterclockwise

Outline Drawings

Standard, wide, long and quick disconnect mounting

Click a section heading to show the matching drawing image and the travel notes shown in the PDF.

The outline drawing sheet in the PDF is used to verify installation space, lever travel direction, mounting style, and terminal layout before selecting a part number.

What the drawing shows

The diagrams identify the mounting footprint, pipe tap area, quick disconnect locations, and the A through G travel callouts used in the PDF tables.

How to read it

Start with the mounting style, then confirm the travel table, then check the pipe tap and hole pattern against the enclosure layout.

Reference panel

Standard Mounting

Standard Contacts

Related drawing and travel notes

Shows the standard switch mounting style, the pipe tap reference and the A to E travel notes.

A. Trip TravelB. Reset TravelC. Recommended TravelD. Total TravelE. Torque to Trip

PDF section detail

Standard: Standard Contacts

Wide: Maintained Contacts & Lever Position

Long: Maintained Contacts - Lever Returned

QDC: Quick Disconnect Mounting

EA740 Series Harsh Environment With Accident Conditions

Built for nuclear qualified service

Precision, Packed Into Every Switch

Travel Data, One Section at a Time

Standard Contacts

Maintained Contacts & Lever Position

Maintained Contacts - Lever Returned

Build the part number from the PDF

Standard, wide, long and quick disconnect mounting

Precision, Packed Into
Every Switch

Travel Data,
One Section at a Time

Build the part number
from the PDF