Allen Bradley 1494V series variable depth flange mounted isolation switch

Allen Bradley 1494V series variable depth flange mounted isolation switch

Core framework and scope of application

The document categorizes six types of isolation switch kits, namely 30A, 60A, 100A, 200A, 400A, and 600A, based on current levels as the core dimension. Each type is classified according to the production year/series (such as Series A, Series B, Series D, etc.), clarifying the core components, fuse clip adaptation specifications, and accessory compatibility of the kits for each period. Applicable scenarios cover circuit isolation requirements in industrial power distribution systems that require flange installation and variable depth layout. It complies with UL, CSA, NEMA, ANSI and other standards, and is compatible with NEMA 1, 3R, 4, 4X, 12 and other protection level enclosures.

Core parameters of isolation switch kits for each current level

（1） Common Basic Information

Structural design: Both are 3-pole, 600V AC specifications, divided into right-hand type (model including "DS") and left-hand type (model including "DSX"). The left-hand type requires an additional adapter kit (such as 1495-N24, 1495-N25); Some series need to be used in conjunction with Trailer Fuse Blocks, and both must have the same series letters (such as Series A switches with Series A fuse blocks).

Fuse adaptation: Supports multiple types of fuses such as Class H, J, R, etc., and distinguishes fuse clip models based on voltage (250V AC/600V AC) (such as 1401-N series). Different current levels correspond to different fuse clip specifications to ensure matching overcurrent protection.

Accessory compatibility: The handle and connecting rod are only compatible within the same kit and cannot be interchanged across kits; Accessories such as auxiliary contacts and fuse covers should be selected according to their series to ensure proper functionality.

（2） Detailed specifications by current level

1. 30A isolation switch kit (1494V-DS30/DSX30 series)

Production Stage and Components

1975-2004 (Series A): Includes 1494V-DS30 Series A switch (left and right hands), fuse clip compatible with 1401- N41（250V Class H）、1401-N42（600V Class H&J）。

2004-2005 (Series 1): The switch remains unchanged, with the addition of 250V Class R (1401-N50) and 600V Class R (1401-N51) fuse clip adapters.

2005 (Series 2): The right-hand type is 1494V-DS30 Series B, the left-hand type is 1494V-DSX30 Series B, and the fuse clip specifications are the same as Series 1.

Since 2006 (Series 3): The switch has been upgraded to 1494V-DS30 Series D (right-hand) and 1494V-DSX30 Series D (left-hand), with accompanying trailer type fuse blocks (1494V-FS30 Series D, etc.).

Core accessories: The handle can be selected from 1494V-H1 (painted), 1494V-W1 (stainless steel), or 1494F series (plastic/painted/stainless steel); The connecting rod is divided into short styles (1494V-RA1/RA3) and long styles (1494V-RA2/RA4); The fuse cover is 1495-N56/N59/N64, etc., and the auxiliary contacts can be selected from 595-A (normally open), 595-B (normally closed), or 1495-N8/N9.

2. 60A Isolation Switch Kit (1494V-DS60/DSX60 Series)

Core difference: Upgraded fuse clip specifications, 250V Class H is 1401-N42600V Class H&J is 1401-N43250V Class R is 1401-N51600V Class R is 1401-N52; The trailer type fuse block model is the 1494V-FS60 series, and the accessory type is similar to the 30A kit, but the fuse cover has added the 1495-N66 model.

Adaptation scenario: It can carry higher current than the 30A kit and is suitable for power isolation of medium power industrial equipment such as medium-sized motors and frequency converters.

3. 100A Isolation Switch Kit (1494V-DS100/DSX100 Series)

Series Evolution: Series A from 1975-1993, Series B from 1993-2004, Series C from 2005, and Series D from 2006 to present; The fuse clips are unified as 1401-N44 (250V/600V Class H&J) and 1401-N53 (250V/600V Class R), and the matching trailer type fuse block is the 1494V-FS100 series.

Accessory features: In addition to conventional models, the auxiliary contacts require an adapter 1495-N24 for the left-hand type and 1495-N64/N65/N66 for the fuse cover, meeting the safety protection requirements in high current scenarios.

4. 200A-600A high current isolation switch kit

200A (1494V-DS200/DSX200 series): The fuse clip is 1401-N45 (Class H), 1401-N54 (Class R), and the trailer type fuse block is 1494V-FS200 series; The fuse cover is designed for both left and right hands (1495-N62/67), and the left-hand type requires an adapter 1495-N25, suitable for high-power motors and large distribution cabinets.

400A (1494V-DS400/DSX400 series): The handle has been upgraded to 1494V-H2 (painted) and 1494V-W2 (stainless steel), and two connecting rods are required in a set (1494V-RB1/RB3 short version, RB2/RB4 long version); The fuse cover is 1495-N61/63/68, and the auxiliary contacts need to be matched with adapter 595-N1 to adapt to high-power industrial systems (such as factory power distribution).

600A (1494V-DS600/DSX600 series): Supports direct bolt fixation of Class J fuses, or can be paired with independently installed fuse blocks (1491-N621/R621 series); The accessories are compatible with the 400A kit and are mainly used in high-power scenarios such as large factories and data center power isolation.

Accessory system and selection requirements

（1） Classification of core accessories

Operation category: Handle (divided into spray painted/stainless steel/plastic according to material, H1/H2, F-P1/M1/S1 series according to current level), connecting rod (divided into RA/RB series according to length and current level, multiple high current kits need to be matched).

Protection category: Fuse cover (classified by series and left and right hands into models N56/N59/N61-N68, etc., to prevent accidental contact with live parts).

Auxiliary function category: auxiliary contacts (normally open/normally closed, such as 595-A/B, 1495-N8/N9), adapters (dedicated for left-hand switches, 1495-N24/N25).

（2） Key selection rules

Series matching: The isolation switch and trailer type fuse block must have the same series letter (such as Series D switch with Series D fuse block), otherwise they cannot be assembled properly.

Current adaptation: The fuse clip, handle, and connecting rod should be selected according to the rated current of the isolation switch (for example, H2/W2 series handles are required for 400A/600A, and H1 series handles with 30A cannot be used).

Differentiation between left and right hands: Left hand switches require additional ordering of corresponding adapters, and accessories (such as fuse covers) are divided into left and right hand specific models. The installation direction needs to be clarified before selection.

Product advantages and expansion series

（1） 1494V series core advantages

Reliability: Adopting a sturdy structure and mature design, with a long service life; Compliant with multiple international standards, there is no lag in the "on/off" position during operation (snap action design), avoiding misoperation.

Security: Visible blade structure, power off status is intuitively visible; The flange structure ensures that the switch and handle are always connected (in accordance with NFPA 79 standard), and an optional fuse cover prevents accidental contact with live parts.

Flexibility: Supports multiple types of fuses, accessories can be ordered separately or purchased as a kit, suitable for different installation depths, and compatible with multiple protection levels of enclosures.

（2） Related extended product series

At the end of the document, Allen Bradley's other isolation switch series were added for users to expand their selection as needed:

1494C series: Cable operation flange installation isolation switch (30A-400A, cable length 3 '-10').

1494G series: Closed safety isolation switch (30A-600A, 2/3/6 poles, multiple shell materials and protection levels).

1494F series: Fixed depth flange mounted isolation switch (30A-200A, compatible with NEMA 1/12 enclosure).

1494D series: Fixed depth flange mounted circuit breaker operating mechanism (125A-1200A, compatible with circuit breaker frame).

Precautions for use and maintenance

Pre installation inspection: Confirm that the isolation switch series matches the fuse block and accessory model, and that the left-hand switch is equipped with the corresponding adapter.

Operation specifications: The handle and connecting rod can only be replaced within the same kit, and cannot be mixed across current levels or series to avoid mechanical failure.

Regular maintenance: Check if the fuse cover is intact and if the auxiliary contact is reliable. For high current kits (400A/600A), it is necessary to regularly check the fastening status of the connecting rod to prevent overheating and loosening.