Siemens SN421 Disconnect Switch, 30A, 3-Pole, 240V

The Siemens SN421 Disconnect Switch is a dependable, three-pole isolation solution designed for demanding industrial environments. With a 30 A rating and 240 V operation, this switch delivers clear, decisive electrical isolation for service, maintenance, and replacement projects, helping technicians work safely and efficiently.

Key specifications

• Manufacturer: Siemens
• Part Number: SN421
• Product Type: Disconnect Switch
• Amperage: 30 A
• Poles: 3
• Voltage: 240 V

Why this disconnect switch matters

In industrial settings, reliable isolation is critical. The SN421’s three-pole configuration ensures all phases can be disconnected simultaneously, reducing the risk of stray currents during maintenance or equipment replacement. Built for durability in service environments, it supports quick, safe shutdowns without compromising performance, helping keep downtime short and crews protected.

Ideal use cases

• Industrial electrical service installations requiring safe circuit isolation
• Maintenance shutdowns on heavy machinery and equipment
• Replacement projects where a proven, compatible disconnect switch is needed
• Panel upgrades or rewiring efforts that require a robust, industry-standard isolator

Compatibility and support

Notes: Verify fit by part number and application requirements. The SN421 is the specified disconnect switch for applications that match its 30 A, 3-pole, 240 V configuration.

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