Eaton ER4-400N3PR Enclosed Rotary Disconnect - NEMA 4
Part Number: ER4-400N3PR
Quick Summary
Eaton ER4-400N3PR is an enclosed rotary disconnect switch designed for safe isolation in electrical panels and outdoor enclosures. Installers often struggle with non-fused units that complicate safety compliance, increase downtime, or demand extra components. This model carries CE marking and a NEMA 4 rating, with 600 V and 400 A ratings, supporting rugged industrial applications. Designed for non-fused isolation with a pistol handle, it simplifies operation, reduces maintenance steps, and integrates with Bussmann series protective devices. Applications span motor control centers, power distribution panels, and outdoor substations where reliable, code-compliant isolation is critical. In practice, customers report faster commissioning, fewer spare parts, and improved safety records after adopting this design.
Product Information
Extended Description
ER4-400N3PR Eaton: Eaton Bussmann series enclosed rotary disconnect switch, Non-fused, Pistol handle, 600V, 400A, Red, NEMA rating 4
Product Name
Eaton Bussmann series enclosed rotary disconnect switch
Catalog Number
ER4-400N3PR
UPC
051712420280
Product Length/Depth
0.001 in
Product Height
0.001 in
Product Width
0.001 in
Product Weight
19 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
400A
NEMA rating
NEMA 4
Voltage rating
600 V
Special features
Non-fused, Pistol handle
ER4-400N3PR~ENC DISC400NF NEMA4 RED
ER4-400N3PR~ENC DISC400NF NEMA4 RED
Eaton Specification Sheet - ER4-400N3PR
Feature → Business Impact → Application: The non-fused enclosed rotary design provides safe, code-compliant isolation without the complexity of managing fuses, reducing spare parts and maintenance steps while improving personnel safety in routine switching. Application: ideal for power distribution panels and motor control centers where quick, reliable disconnection is needed. Feature → Business Impact → Application: Pistol handle enables one-handed operation and fast actuator engagement, lowering operator fatigue and increasing site productivity during commissioning, testing, and routine maintenance. Application: field installs and service calls in constrained or hazardous environments benefit from easier, safer operation. Feature → Business Impact → Application: NEMA 4 enclosure delivers weather- and dust-resistance for indoor and outdoor use, minimizing commissioning delays and protecting sensitive circuits. Application: outdoor substations, washdown areas, and harsh factory floors where environmental protection is essential. Feature → Business Impact → Application: 600 V 400 A electrical rating supports high-current circuits with robust protection, reducing the need for multiple devices and enabling scalable power distribution. Application: large motor loads and process lines in manufacturing facilities requiring reliable isolation and rapid restoration. Feature → Business Impact → Application: CE marking ensures regulatory alignment for international projects, easing procurement across multi-region sites. Application: global rollouts and compliant installations in industries such as food & beverage, chemicals, and machinery manufacturing.
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FAQs
The ER4-400N3PR is designed as an enclosed rotary disconnect with a NEMA 4 rating, suitable for standard electrical panels and outdoor enclosures. It supports up to 600 V and 400 A, ensures safe isolation, and integrates with Bussmann series protection devices. Mounting is straightforward in typical panel layouts, reducing retrofit time and enabling consistent installations across projects.
A 600 V rating indicates suitability for medium-voltage control circuits and distribution panels, while 400 A defines the maximum continuous current the switch can safely interrupt. Together, they accommodate high-demand equipment like motors and drives, enabling reliable isolation without the need for supplementary switching gear and helping meet load and short-circuit protection requirements.
Yes. The ENclosed design with a NEMA 4 rating provides weather resistance against dust, water ingress, and washdown conditions. This makes the ER4-400N3PR appropriate for outdoor substations, exterior panels, and process environments where protection from the elements is critical, while CE marking confirms compliance with applicable European standards.
Non-fused operation eliminates fuse replacement steps, reducing spare parts inventory and maintenance time. This translates to faster commissioning and quicker restoration after switching events. Operators benefit from simplified procedures, fewer potential fuse-related failures, and improved overall system uptime in high-demand industrial settings.
Plan for a robust enclosure in line with NEMA 4 requirements, verify the 600 V/400 A rating matches the supply and loads, and ensure compatible Bussmann series protection devices are present. Use the pistol handle for safe actuation, and confirm CE marking for multi-region projects. Proper labeling and routine inspection will sustain safety and reliability over the equipment’s life cycle.