Name: MEAN WELL SPD-20 series: surge protection device - SPD-20-277P
Brand: MEAN WELL
SKU: SPD-20-277P
Price: 37.46 USD
Availability: InStock

MEAN WELL SPD-20 series: surge protection device - SPD-20-277P

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Description

SPD-20-277P — Surge protection device

MEAN WELL SPD-20-277P is a three-wire parallel surge protection device for 277 VAC, 50/60 Hz TN systems. It protects LED-driver installations against line-to-ground and line-to-line transients, with a 20 kA maximum 8/20 µs surge-current rating and 320 VAC maximum continuous operating voltage.

Download MEAN WELL SPD-20 Datasheet (PDF)

SPD-20 specifications, connection drawing and installation instructions: combined catalog pages 5–6, specification dated 2024-09-25.

Electrical and surge ratings

Parameter	Details
Complete model / connection	SPD-20-277P; SPD-20 series; three-wire parallel connection for a TN system.
Operating supply	277 VAC, 50/60 Hz.
Maximum continuous operating voltage (MCOV)	320 VAC. This continuous-voltage limit is distinct from a transient surge or withstand-test voltage.
Voltage protection rating (VPR)	1,500 V for L–FG, N–FG and L–N.
Nominal discharge current In	5 kA.
Maximum surge current	20 kA with an 8/20 µs waveform; a transient surge capability, not a continuous load-current rating.
Short-circuit current rating (SCCR)	5 kA. The catalog surge/SCCR test uses a Class J fuse rated 30 A and at least 600 VAC; preserve this test condition when assessing the installation.
Response time	Less than 25 ns.
Voltage withstand test	1,600 VAC for 1 minute, with the varistors removed as required by the test note. This is not a normal supply-voltage rating.

Protection and operating conditions

Parameter	Details
Protection paths	Line-to-ground and line-to-line surge protection. The unit connects in parallel; it is not the series-connected SPD-20HP model.
Ingress protection	IP67 design for indoor or outdoor installations, as specified in the catalog.
Operating temperature	−40°C to +70°C.
Status indication	After energizing, the LED indicator should illuminate. If it is out, the SPD requires service.
Surge-voltage capability	10 kV surge protection capability is stated in the feature list; apply the separate operating-voltage and path-specific VPR limits.

Dimensions and connections

Parameter	Details
Dimensions	90 × 70 × 50 mm (L × W × H). Mechanical drawing: case SPD-20A; general tolerance ±1 mm.
Mounting	Two opposed mounting slots are shown with Ø4.2 mm callouts. Use the complete mechanical drawing to locate and size the mounting arrangement.
Input-side connections	Black = AC/L; white = AC/N; green = FG/PE. Connect these three leads in parallel with the line, neutral and protective-earth conductors shown in the diagram.
Leads	10 AWG FEP wires, each 150 ±5 mm in the drawing.
Unit mass	390 g, catalog packing reference per unit. Carton reference: 18 pieces / 8 kg / 0.84 CUFT; the carton figure is not the mass of one product.

Installation

Parameter	Details
Connection system	Connect in parallel with the line of a TN system. Follow the model-specific installation diagram.
Before installation	Measure the service voltage with a voltmeter and verify that the selected SPD is suitable. Do not install it if the measured voltage exceeds its rating. The operating-voltage specification for this model is AC; the voltage-check instruction does not establish a DC operating rating.
Power isolation and wiring	Remove power from the electrical system before installation. Verify every connection before energizing. Apply power and confirm that the LED indicator illuminates; an unlit indicator requires service.
Qualified installation	Installation must be performed by qualified electrical personnel in accordance with all applicable codes. Read and follow the complete instructions; incorrect installation can impair surge protection and create electric-shock, explosion or arc-flash hazards.
Grounding and damage	Never install on an ungrounded system. Do not install a unit that has fallen, been dropped or appears damaged; return it to the manufacturer for diagnostic testing.

Standards and reliability

Parameter	Details
Safety standards	UL 1449, Third Edition; CS22.2 No. 8 (designation as printed in the catalog). BS EN/EN 61643-11 is listed only for SPD-20-240P.
UL assembly type	Type 2 component assembly.
Reliability reference	MTBF: at least 4,508,600 hours per Telcordia SR-332 (Bellcore), or 7,162,400 hours per MIL-HDBK-217F at 25°C. These are calculated reliability references, not guaranteed service-life values.