SolaHD SDN-D series rail mounted high-performance power supply

Product Overview

SDN-D is a compact high-performance DIN rail switching power supply launched by Emerson SolaHD, designed for harsh industrial environments and hazardous locations. It is 31% smaller in size than the previous generation SDN-C and has no fan for natural cooling.

Model and power specifications

Model Output Voltage Rated Current Rated Power 60 ℃ Continuous Power

SDN 10-24-100D 24Vdc 10A 240W 240W

SDN 20-24-100D 24Vdc 20A 480W 480W

SDN 40-24-100D 24Vdc 40A 960W 960W

Core electrical parameters

1. Input

Global voltage: AC 90-264V (50/60Hz); DC 90–375V

Power factor:>0.98

Harmonic THDi:<10% (120Vac)

Surge immunity: 2kV (L-N), 4kV (L-PE)

2. Output

Adjustable range: 24~29Vdc (precise adjustment with 3-turn potentiometer)

Factory setting: 24.5V ± 1%

Ripple:<50mVp-p

Holding time: ≥ 20ms (100Vac)

3. Efficiency and heat generation

Maximum efficiency of 95% (240Vac)

Typical loss: 10A model only 12.6W

Three major power enhancement capabilities

Continuous power boost: 120% output at ≤ 50 ℃ (10A → 12A, 20A → 22A, 40A → 44A)

Inductive load startup: 1.5 times current for 4 seconds

Fault breaking peak value: 6 times the current for 15ms, reliably melting downstream fuses

Environment and reliability

Working temperature: -40 ℃~+70 ℃

Linear derating at 60-70 ℃: 10A reduced to 216W; 20A reduced to 360W; 40A reduced to 720W

MTBF: up to 1048000 hours (230Vac/25 ℃/20A)

Design lifespan: up to 453100 hours

Warranty: 5 years

Protection function

Protection type action condition recovery method

Short circuit protection, continuous short circuit, automatic recovery

Overvoltage protection>32V automatic recovery

Over temperature protection, over temperature automatic recovery

Reverse electromotive force protection<35V without damage, automatic recovery

Diagnosis and status indication

Dual color LED: green=normal; Red=Protection/Fault

DC OK relay: operates when output>18.5V, contact 50V/1A

Optional SCM communication module: Real time monitoring of voltage/current/temperature/alarm, supports EtherNet/IP, Modbus TCP, HART7

Explosion proof and global certification

UL/CSA：Class I Div 2，Class I Zone 2

ATEX/IECEx：II 3G Ex ec IIC T4 Gc

Temperature code: T4

Compliant with RoHS, EN62368, EN61010

Installation and wiring

Installation: TS35 DIN rail buckle type; Optional panel bracket

Output: Dual terminal, convenient for multiple devices to be connected in parallel

Wire diameter: 10/20A using 16-10AWG; 40A using 7-6AWG

Heat dissipation space: 25mm up and down, 10mm left and right

Optional accessories

SCM communication module (3 models)

SCM‑E‑EIP：EtherNet/IP

SCM‑E‑MBUS：Modbus TCP

SCM‑W‑HRT7：HART7

SDN redundant module

SDN-PMBRK3 panel installation bracket

Key issues

Question 1: What are the effects of SDN-D’s 120% continuous power boost, 1.5 times startup current, and 6 times peak current?

answer

120% continuous improvement: meets long-term light load upgrades or short-term expansion needs, stable output at ≤ 50 ℃, without the need to replace larger power supplies.

1.5 times/4 seconds: Specially designed to drive high starting impact inductive loads (motors, solenoid valves) to ensure smooth start-up.

6 times/15ms: Provides peak current for fault breaking, quickly fuses downstream fuses in case of output short circuit, achieving selective protection.

Question 2: How does SDN-D reduce its power capacity in high temperature environments (60-70 ℃)? What are the differences among the three models?

Answer: All models experience a linear derating starting from 60 ℃ and reaching the lower limit at 70 ℃

10A (240W): Reduced to 216W (decreased by 10%)

20A (480W): Reduced to 360W (25% decrease)

40A (960W): Reduced to 720W (25% decrease)

Low power models have less capacity reduction and are more suitable for high-temperature enclosed cabinets.

Question 3: What are the levels of diagnostic capabilities of SDN-D? What scenarios are they applicable to?

The answer is divided into three levels of diagnosis:

Basic level: Dual color LED indicator light, quick on-site judgment of operation/malfunction.

Entering the class: DC OK relay, connected to PLC for remote dry contact alarm.

Network level: SCM communication module, which uploads voltage, current, temperature, and event logs through the bus, suitable for centralized monitoring in digital factories.