49AB20 – Siemens Contactor & Motor Starter Auxiliary (Verified Specs)

The Siemens 49AB20 is an auxiliary contact block used with Siemens 49 Series contactors and motor starters. It is designed to expand the control functionality of a contactor by adding additional signaling contacts for control circuits, PLC inputs, and interlocking applications.

Key Technical Specifications

• Part Number: 49AB20
• Manufacturer: Siemens
• Product Type: Auxiliary Contact Block
• Series: 49 Series
• Contact Configuration: 2NO (Two Normally Open contacts)
• Voltage Rating: 600 VAC (typical industrial control rating)
• Application Size Range: Suitable for contactors / motor starters size 00–4
• Mounting Type: Snap-on / side-mounted accessory
• Connection Type: Screw terminal connection
• Standard Compliance: UL / CSA (industrial control accessory ratings vary by installation system)

What It Does (Function)

This device does not switch main power. Instead, it:

• Provides extra control contacts (NO contacts)
• Sends status feedback (ON/OFF indication of contactor)
• Enables interlocking between control circuits
• Allows PLC or control panel logic expansion
• Can trigger auxiliary devices (alarms, indicators, relays)

Typical Applications

• Motor control centers (MCCs)
• Industrial automation panels
• PLC feedback circuits
• Interlocking systems
• Status indication (RUN/STOP signaling)
• Auxiliary device triggering

Returns are easy

You may return items within 30 days of delivery for a refund.

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