Issue:
What type and rating of overcurrent protection is required for SDSA 3-Phase Surge Protective Devices to ensure compliance with applicable electrical codes and manufacturer specifications?

Product Line:
Surge Protective Devices (SPDs)

Environment:
SDSA, 3ph

Cause:
Breaker specification to protect equipment

Resolution:

SDSA 3-Phase Surge Protective Device (SPD) – Wiring and Connection Options

The SDSA 3-Phase SPD is pre-wired with #12 AWG conductors and supports multiple installation methods:

1. Tap Connection to Existing Circuit
   The SPD may be connected in parallel to an existing circuit protected by a 20A or smaller breaker, provided the breaker’s terminals are UL-listed for multiple conductors of the same size and type.

2. Dedicated Breaker Connection
   The SPD can be connected to a dedicated 20A, 3-pole circuit breaker for isolated protection and serviceability.

3. Direct Bus Connection (Type 1 Installation)
   As a UL 1449 Type 1 SPD, the device is rated for line-side installation and may be connected directly to the service entrance bus without the need for an upstream overcurrent protection device (OCPD), in accordance with NEC guidelines.

For technical support or to speak directly with a Surge Protection Specialist, please call 800-577-7353 or email spdtag@se.com.

Released for: Schneider Electric USA