Cut Sheet

Commercial Products
Switch and Outlet BOxeS and cOverS
Visit our website at www.appletonelec.com or contact us at [phone].
© February 2015
1423
NEC/CEC:
UL Standard: 514A
UL Listed: E2527
NEMA: OS-1
4” Square Boxes - 1-1/2" Deep
With Knockouts
Depth
(inches)
Wiring Cubic
Inch Capacity
Knockout Description
Weight per
100 kg (lb)
Catalog Number
(Universal No.)Sides Ends Bottom
1-1∕2 21.0 (6)3∕4” —
(2)1∕2”
(2)3∕4”
36.74
(81.0)
4SVB3/4PL
(52151-V-3∕4)
1-1/2” Deep, Welded;
Plain vertical bracket
1-1∕2
21.0
(6)1∕2”
(3) Eccentric
KO
—
(2)1∕2”
(2) Eccentric
KO
36.74
(81.0)
4SVB-EK-PL
Red
Box
Option
1-1∕2
21.0
(6)1∕2”
(3) Eccentric
KO
—
(2)1∕2”
(2) Eccentric
KO
36.74
(81.0)
4SVB-EK-PLRD 
1-1/2” Deep, Welded;
Plain vertical bracket
1-1∕2 21.0
(6)1∕2”
(3) Eccentric
KO
—
(2)1∕2”
(2) Eccentric
KO
40.37
(89.0)
4SOB-EK
1-1/2” Deep, Welded; 1-3/8”
offset vertical bracket
1-1∕2 21.0
(6)1∕2”
(3) Eccentric
KO
—
(2)1∕2”
(2) Eccentric
KO
37.19
(82.0)
4SAB-EK
1-1/2” Deep, Welded;
Vertical bracket with barbed
hooks
1-1∕2 21.0
(6)1∕2”
(3) Eccentric
KO
—
(2)1∕2”
(2) Eccentric
KO
35.38
(78.0)
4SB-EK
(52151-B-1∕2)
1-1/2” Deep, Welded; Stud
NL bracket set flush with
front of box
 For fire alarm circuits. Red powder coat finish.