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Surge Protective Devices

SPDN-D Series

Littelfuse.com/SPDN

Speciﬁcations are subject to change without notice.

Revised: 04/25/2023

Description

Surge protective devices (SPDs) provide equipment protection from transient overvoltage events lasting micro-seconds. By

limiting the overvoltage to the equipment during these events, costly damage and downtime can be mitigated.

The NEMA-style SPDN series for external panel mount is available for 120 V to 480 V nominal voltage sub-distribution

board applications.

Features & Beneﬁts

FEATURES BENEFITS

More direct modes of protection (L-N, N-G) in a

smaller package

Increases protection and design flexibility

Capability to clamp and withstand high-energy

transients

Ensures low-residual voltage during high-energy surge events and

higher nominal discharge current to prevent disruption, downtime, and

degradation or damage to equipment

Stacked Metal Oxide Varistor (MOV) design

Provides more high-transient voltage protection in a compact, multi-

layered structure

Installs on the line or load side of the circuit breaker

Simplifies maintenance—without impacting the other parts of the

electrical system—by turning breaker off during upkeep

Thermally protected MOV Eliminates catastrophic failure

External LED indicator Quickly identifies service requirements to avoid loss of protection

Compact footprint Offers easy retrofit in existing applications where space is limited

Applications

• Construction

• Food and Beverage

• HVAC/R

• Light Industrial

• Oil and Gas

• Water/Wastewater

UL Type 1

REACH

2 of 3

Surge Protective Devices

SPDN-D Series

Littelfuse.com/SPDN

Speciﬁcations are subject to change without notice.

Revised: 04/25/2023

Speciﬁcations

Maximum Surge Current Rating Up to 50 kA per phase

I-nominal Rating 20 kA

UL1449 Short Circuit Current Rating 200 kA

Direct Modes of Protection L-N, N-G

UL Type Type 1

Protective Elements Stacked High Energy MOV

Response Time (L-N / N-PE tA) < 25 ns

Mechanical & Environmental

Operating Temperature Range (Ta) -35 °C to +85 °C (-31 °F to +185 °F)

Operating Frequency 50–60 Hz

Typical Connection 18” #12 AWG (pre-wired pig tails)

Permissible Operating Humidity (RH) 0 % to 95 % non-condensing

Altitude (max) 4,000 m (13,123 ft)

Degree of Protection IP20 (built-in)

Housing Material Polycarbonate NEMA 4X – Lid ultrasonically sealed

Thermal Protection Yes

Operating State/Fault Indication 1 Green LED (for each phase)

Product Dimensions H 2.75”; W 4.25”; D 2.41”

Product Weight 0.5 lb

Package Dimensions 4-3/8” x 3-1/2” x 9-1/2”

Package Weight 0.7 lb

Certiﬁcation & Compliance

cULus UL 1449, 5th Edition; E320116

RoHS RoHS 2 Directive 2011/65/EU; Directive (EU) 2015/863

REACH Regulation (EC) No 1907/2006

Part Numbering System

SPDN-D VVV-PC

Phase ConfigurationSeries

1P = Single Phase 2S = Split Phase

3Y = 3 Phase WYE

Nominal System Voltage

Ordering Information

ORDERING

NUMBER

NOMINAL SYSTEM

VOLTAGE

PHASE

CONFIGURATION

MAXIMUM CONTINUOUS

AC OPERATING VOLTAGE

(MCOV)

VOLTAGE PROTECTION RATING (VPR)

L-N L-G N-G L-L

SPDN-D120-1P 120 Single Phase 180 700 1200 600

SPDN-D120-2S 120/240 Split Phase 180 700 1200 600 1200

SPDN-D120-3Y 208/120 3 Phase WYE 150 600 1000 600 1000

SPDN-D240-1P 240 Single Phase 350 1200 2000 1200

SPDN-D240-2S 240/480 Split Phase 350 1200 2000 1200 2000

SPDN-D277-3Y 480/277 3 Phase WYE 350 1200 2000 1200 2000