diff --git a/pypsse/models.py b/pypsse/models.py
index c125395..3442790 100644
--- a/pypsse/models.py
+++ b/pypsse/models.py
@@ -3,7 +3,7 @@
 from typing import Dict, List, Literal, Optional, Union, Any
 
 import pandas as pd
-from pydantic import UUID4, BaseModel, Field, model_validator
+from pydantic import UUID4, BaseModel, ConfigDict, Field, field_validator, model_validator
 from pydantic.networks import IPvAnyAddress
 from typing_extensions import Annotated
 
@@ -247,6 +247,8 @@ class GeneratorSettings(BaseModel):
 
 class BusFault(BaseModel):
     "Bus fault model defination"
+    model_config = ConfigDict(extra="forbid")
+
     time: float = 0.2
     bus_id: int = 38205
     duration: float = 0.3
@@ -260,12 +262,16 @@ class BusFault(BaseModel):
 
 class BusTrip(BaseModel):
     "Bus trip model defination"
+    model_config = ConfigDict(extra="forbid")
+
     time: float = 0.2
     bus_id: int = 38205
 
 
 class LineFault(BaseModel):
     "Line fault model defination"
+    model_config = ConfigDict(extra="forbid")
+
     time: float = 0.2
     bus_ids: List[int]
     duration: float = 0.3
@@ -279,12 +285,16 @@ class LineFault(BaseModel):
 
 class LineTrip(BaseModel):
     "Line trip model defination"
+    model_config = ConfigDict(extra="forbid")
+
     time: float = 0.2
     bus_ids: List[int]
 
 
 class MachineTrip(BaseModel):
     "Machine trip model defination"
+    model_config = ConfigDict(extra="forbid")
+
     time: float = 0.2
     bus_id: int = 38205
     machine_id: str = ""
@@ -306,6 +316,18 @@ class SimulationSettings(BaseModel):
         List[Union[BusFault, LineFault, LineTrip, BusTrip, MachineTrip]]
     ] = None
 
+    @field_validator("contingencies", mode="before")
+    @classmethod
+    def parse_machine_trip_contingencies(cls, contingencies):
+        if contingencies is None:
+            return contingencies
+        return [
+            MachineTrip(**contingency)
+            if isinstance(contingency, dict) and "machine_id" in contingency
+            else contingency
+            for contingency in contingencies
+        ]
+
     @model_validator(mode="after")
     def validate_export_paths(self):
         base_project_path = self.simulation.project_path
diff --git a/pypsse/simulator.py b/pypsse/simulator.py
index cb04400..682094e 100644
--- a/pypsse/simulator.py
+++ b/pypsse/simulator.py
@@ -135,6 +135,14 @@ def from_setting_files(
             )
 
         simulation_settiings = SimulationSettings(**simulation_settiings)
+        logger.debug(
+            "Simulator parsed contingencies: {}".format(
+                [
+                    type(contingency).__name__
+                    for contingency in simulation_settiings.contingencies or []
+                ]
+            )
+        )
         export_Settings = ExportFileOptions(**export_Settings)
         return cls(simulation_settiings, export_Settings)