ABB vs Siemens: Which is Better for Saudi Petrochemical Projects?

Why This Comparison Matters for Saudi Projects

In Saudi Arabia's petrochemical, oil & gas, and power generation sectors, procurement engineers frequently face the ABB vs Siemens decision. Both are Tier-1 global brands and both are approved vendors for Saudi Aramco (ARAMCO Approved Vendor List), SABIC, SADARA, Marafiq and SEC. So how do you choose?

This comparison covers the product categories most requested in KSA: MV/LV switchgear, PLCs and DCS, motor drives (VSDs), and instrumentation. We look at Saudi-specific factors including local stock, SASO compliance and project specification alignment.

MV Switchgear: ABB UniGear vs Siemens NXAIR / 8DA10

ABB UniGear ZS1 and ZS2

ABB's UniGear ZS1 (air-insulated, IEC 62271-200) and ZS2 (SF6 arc-flash reduced) are widely specified on Aramco utilities and Marafiq substations. Key advantages for Saudi projects:

• **Proven track record** in Aramco's Eastern Province utility substations

• **Arc-flash containment** — critical for plant safety in petrochemical environments

• **Local support**: ABB has a strong Saudi Arabia presence with EPC and utility project teams in Dhahran

• **Approval status**: Pre-approved on most Aramco and Marafiq SAES/MESPS vendor lists

Siemens NXAIR and 8DA10 GIS

Siemens' NXAIR (air-insulated) and 8DA10 (SF6 GIS) are the main competitors. Siemens is the dominant brand in SEC (Saudi Electricity Company) grid substations — a legacy of long-term contracts. For projects interfacing with SEC infrastructure, Siemens switchgear often wins on system compatibility.

**Verdict for Saudi MV switchgear**: Both are equally strong technically. Choose based on the project's utility interface. Aramco projects → lean ABB. SEC grid projects → lean Siemens.

Low-Voltage Switchgear: ABB MNS vs Siemens SIVACON

ABB MNS

ABB's MNS LV switchgear is a global benchmark for motor control centres (MCCs) and power distribution boards. In Saudi petrochemical projects:

• Modular draw-out units simplify maintenance shutdowns

• Internal arc classification (IAC) to IEC 61641 reduces risk in enclosed plant areas

• Compatible with ABB ACS880 and ACS580 drives for full MCC-to-drive integration

Siemens SIVACON S8

SIVACON S8 is Siemens' answer — also IEC 61439-2 compliant, internal arc rated. Its advantage is tighter integration with Siemens SENTRON breakers and SIMATIC PLC systems, reducing communication configuration effort on Siemens-primary EPC packages.

**Verdict for LV switchgear**: Near parity. If the project uses Siemens SIMATIC PLC, SIVACON reduces integration work. For mixed or ABB-primary automation, MNS is the stronger choice.

PLCs and DCS: ABB AC500 / System 800xA vs Siemens S7 / PCS 7

This is where the sharpest difference exists for Saudi projects:

Siemens SIMATIC S7 and TIA Portal — The Saudi Standard

Siemens S7 PLCs (S7-1200, S7-1500, S7-300/400 legacy) dominate the Saudi market. Reason: SABIC's early automation standardization on Siemens SIMATIC and PCS 7 DCS created a generation of Saudi engineers trained exclusively on Siemens. SABIC engineering standards (SABIC ES) often specify Siemens-compatible PROFIBUS/PROFINET.

• **Largest installed base** in KSA manufacturing and petrochemical

• **Spare parts availability** — faster local stock in Riyadh, Jubail and Jeddah

• **Engineering talent** — more Saudi/expat engineers with Siemens certification

ABB System 800xA and AC500 PLC

ABB's 800xA is the market leader in large process industries (upstream oil & gas, offshore). Aramco's refinery DCS projects frequently specify ABB 800xA. For pure process automation with large I/O counts, 800xA has a strong advantage:

• Functional Safety (SIL 2/3) built-in for Safety Instrumented Systems

• Tighter integration with ABB drives, motors and instrumentation

**Verdict for PLCs/DCS**: Siemens for discrete manufacturing and SABIC projects. ABB for upstream Aramco and large refinery DCS. SADARA (SABIC-Dow JV) used Siemens PCS 7 on many units — check project-specific specs first.

Motor Drives (VSDs): ABB ACS880 vs Siemens SINAMICS G/S Series

Both brands offer premium drive solutions:

|---|---|---|

For high-power pump and compressor drives on Aramco or Marafiq projects, ABB ACS880 industrial drives have a strong position. For standard HVAC and conveyor applications, Siemens G120X is widely stocked and cheaper for medium power ranges.

Total Cost of Ownership in Saudi Arabia

Hidden cost factors specific to KSA procurement:

1. **Spare parts availability**: Siemens has wider distributor coverage nationally; ABB strength in Eastern Province

2. **Training and commissioning**: More Siemens-trained engineers means lower commissioning cost on Siemens packages

3. **Service contracts**: Both offer Saudi Arabia service — ABB through ABB Enterprise Software SA; Siemens through Siemens Saudi Arabia

4. **Import lead time**: Both maintain regional warehouses in Dubai/Dammam; standard lead time 4–12 weeks for non-stock items

Conclusion: Which Brand Wins?

There is no universal answer — Saudi project specifications usually determine the outcome. But as a guide:

• **Aramco refinery / upstream** → ABB (switchgear, DCS, drives)

• **SABIC / SADARA petrochemical** → Siemens (PLC, DCS, MV switchgear)

• **SEC utilities** → Siemens (legacy grid compatibility)

• **Marafiq / NEOM utilities** → Either; check vendor list

• **Vision 2030 giga-projects (non-defined)** → Compare project specs; ABB and Siemens both approved

**Need pricing on ABB or Siemens for your Saudi project?** Submit an RFQ to Razz Middle East — we are authorized distributors for both brands and can source the exact model with SASO certification within 4 hours.