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Double Throw Safety Switches

Application Data

Class 3140

Situations Requiring Fuses 30–100 A Type DT (Series F): Select DT switches from pages 3-15, 3-16, which have provisions for accepting fuses. 30, 200–600 A Type 82,000 (Series E, T4, A), all DTU devices: Use the non-fusible double throw switches from pages 3-15, 3-16 in conjunction with standard fused devices, and install them according to the diagram 1 or 2.

 

Table 3.40:

UL Listed Short Circuit Current Ratings

Switch Type	Ampere Rating	Voltage Rating	UL Listed Fuse Class	Short Circuit Current Rating a (A)
Type DT (Series F)	30–100 A	240 V or 600 V	H, K	10,000
			R, J	200,000
Type DTU b (Series F)	30–100 A	240 V or 600 V	H or K	10,000 c
			R, J or T	200,000
DTU224NRB and DTU324NRB (Series E)	200 A	240 V	H, K	10,000 c
DTU324N (Series E)	200 A	240 V	H, K	10,000 c
			R, J	100,000
Type 82,000	all	240 V	H, K	10,000 c
			R, J	100,000 d
		600 V	H, K	10,000 c
Type DTU (A series)	600 A	240 V or 600 V	H, K	10,000
			R, J, T	100,000

a	Rating applies to AC only. The UL Listed short circuit current rating for non-fusible switches is based on the switch being used in conjunction with the corresponding fuse type. Evaluation of non-fusible switches in conjunction with molded case circuit breakers has not been performed.

b	The DTU361 and DTU361RB are also suitable for use on a circuit capable of delivering not more than (A) 18 kA, 600 Vac maximum when protected by Type FH circuit breaker rated 30 A maximum or (B) 14 kA, 600 Vac maximum when protected by Type FA circuit breaker rated 30 A maximum.

c	Any brand of circuit breaker or fuse not exceeding the ampere rating of the switch may be used ahead of a non-fused safety switch when there is up to 10 kA short circuit current available.

d	400 A 82,000 switch is only 10 kA.

 

Table 3.41:

Terminal Lug Data for Type DT, DTU (Series F) Double Throw Safety Switches

Switch	Wires per Phase	NEMA 1, 3R, 4, 4X, 12			Optional Copper Only Lug
		Wire Range Wire Bending Space Per NEC Table 373-6 AWG/kcmil	Standard Lug Wire Range AWG/kcmil	Optional Compression Lug Field-Installable
30–60 A Type DT, DTU (Series F)	1	12–2 Al or 14–2 Cu	12–2 Al or 14–2 Cu	C10-14, D8-14, or E6-14 e	See pages 3-11 and 3-13 for appropriate kit. Order 2 kits per switch.
100 A Type DT, DTU (Series F)	1	12–1/0 Al or 14–1/0 Cu	12–1/0 Al or 14–1/0 Cu	VCEL02114S1 f

e	Thomas and Betts catalog numbers.

f	Versa-Crimp® catalog numbers.

 

Table 3.42:

Terminal Lug Data for Types 82,000 and for A and E-Series DTU devices g

Switch	Wires per Phase	Wire Range Wire Bending Space Per NEC Table 373-6 AWG/kcmil	Lug Wire Range AWG/kcmil	Optional Compression Lugs Field-Installable
30 A (Series T4) h	1	14–8 Al/Cu	12–2 Al or 14–2 Cu	—
200	1	6–300 Al/Cu	6–300 Al/Cu	VCEL030516H1 i
400	1 or 2	1/0–600 Al/Cu or 1/0–300 Al/Cu	1/0–600 Al/Cu	—
600	2	250–500 Al/Cu	250–500 Al/Cu	—

g	200–600 A switches suitable for 75oC conductors.

h	30 A switches suitable for 60oC or 75oC conductors.

i	Versa-Crimp® catalog numbers.

 

 

DE1	Discount Schedule

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Related Topics

240 V Double Throw page 3-15

600 V Double Throw page 3-16

Dimensions: 30–100 A (Series F) page 3-18

Dimensions: 30, 200–600 A (Series E, T4, A) page 3-19

Accessories page 3-20